Here are my thoughts on cross-reference transistor.
All electronic repairers should read the book equivalent transistor cross reference, if they want to succeed in electronic repairs. The leaf is very important for all engineers and technicians because it can help them find the nearest replacement for the components they looked like the transistor, thyristor, MOSFET, IC, diodes and other components.
The famous transistor cross reference book is Captain Philip ECG semiconductor replacement guide. Content you can find all kinds of specifications for electronic components and IC for schematic. It is a "must have" guide for the manufacture of semiconductors for those who like electronic troubleshooting. The structure or the internal structure of the IC is clearly defined and the parameters of the transistor have been quoted in this book. The price for this handbook is not expensive and an electronic workshop, you need to buy one. Imagine, without this book you will face difficulty in the right component for the substitution.
This book has many types of transistors and data specifications of the bipolar transistor, silicon controlled rectifiers, FET field-effect transistor (MOSFET), junction field-effect transistor (JFET) transistors listed signal, high voltage transistor, so that the horizontal output transistor (HOT), the power transistor silicon, surface-mount transistor-transistor digital and many other species. Even if you have a part number for the replacement of normal transistor Guide data, ECG, Philips is finding replacement force informative. The book only normal transistor replacement supply voltage (V) Current (AMP) and wattage (W) Review of HOT, but the Master Guide ECG represents exposure beyond such as frequency, gain power (EEM) and the outlook . Other hot normal transistor data book gives an excellent and very detailed comparison part number for your reference.
There's a secret that I want to discuss with you the equivalent of the cross-reference shall transistor. If you are interested in the part number of replacement for a transistor signal, a higher voltage, amps, and power is adequate, but not so if you find a part number replacement for the horizontal output transistor (hot). A higher voltage, amps and the power will not work forever, because there are only a few parameters that you need to consider are. You may wonder why the blow transistor, even if a higher voltage, more power and higher performance compared to the original.
The other parameters that you need to see the switching time is that we as a storage and fall time. Several hot different specifications, if you really want to find a replacement for HOT, be sure to use the storage and time parameters are in addition to higher voltages, current and power. Internet searches for the specification of components is just simply the part number tracking component datasheet, data sheet, specification, specifications, data, equivalent, part number, identification, labeling, tack, types, codes and references. In general, the manufacturer's website appears and follows the vendor other electronic page. Click on the websites that you deem to be relevant to the search and hope that you get what you want.
What is the secret above have, in fact, I spent much monitoring of storage and tested in the autumn slightly from the original setting. After replacing the monitor works fine, but only for a short time before it gets really hot. If I can continue to run the monitor, I think the HOT blows! As I am) the place of the heat with a number of other similar share of the specifications, (which is essentially the same as the original, particularly the storage and fall time, the monitor is working perfectly. My golden rule is always the exact number of first before any other number you've found the book cross-reference transistor.
Monday, September 28, 2009
Friday, September 25, 2009
Solid State Hard Drives
Here are my thoughts on solid state hard drives.
In our world of information in their care, we are always looking for the next thing "big". It is often a new chip from Intel or AMD. However, in recent years, the microprocessor is not usually the limiting factor in computer performance.
Although the capacity of hard disk storage has increased significantly in recent years has remained relatively constant speed access. It is a question / problem is fundamental to technology. The hard drive is mechanical, and efforts to improve the speed have been diminishing returns.
A technology that competes with traditional hard disk drive (HDD) is the solid state drive (SSD). A SSD is not mechanically, based on the "flash memory", the same chip technology used to store pictures with your digital camera. A new SSD drive is only 3 years but not more.
An SSD can overcome conventional mechanical hard drives, because the 4X smaller and lighter, it is up to 50 times faster and is more reliable because there are no moving parts, produces less heat and consumes less energy. Disk capacity has improved SSD memory and 250 GB SSDs are now available. Currently, the disadvantage is the price.
SSDs are more expensive than conventional hard disk. An SSD drive now costs about $ 2 per gigabyte, while hard drive costs less than $ 1 per gigabyte. The price of one continues to improve SSD (SSD drives, once sold for more than $ 25 per gigabyte), and the anticipated volume of production, the price difference should be further reduced.
Flash memory is capable of a finite number of rewrites each memory cell (as conventional hard disks). Significant improvements in technology have emerged in recent years. In addition, Intel developed the "load leveling". This technique ensures that all memory cells in the SSD to receive a similar workload. Most SSD manufacturers are now using similar techniques. An SSD should last 10 years or more for the average user.
The main reason for the promising future of SSD is the access speed. A conventional hard drive has a fast access time equal to approximately 5 milliseconds. It sounds fast, but when the microprocessor is capable of millions of instructions per second (MIPS), 5 milliseconds is a bottleneck. SSD may have as few as 100 microsecond access time (50 times faster).
An important question when trying to use this capacity SSD speed is the potential bottleneck caused by the interface. There are 3 common interfaces used today with SSD.
The SATA interface is currently the most common interface used in conventional hard disk, but a SATA interface is limited in the total return, send and receive about 3 Gbps. This may be slow to SSD, which failures in performance. Some units are suitable for SSD performance of more than 5 Gbps.
Seagate Technology, in collaboration with AMD, has recently announced the Serial ATA storage interface for 6-Gbps SATA also called version 3.0, a next-generation technology capable of twice the speed of the faster SATA interface available today. This technology was demonstrated by conventional hard drives, but has an obvious application for the SSD market.
SAS (Serial Attached SCSI) is an alternative interface. SAS is a point in the technology by at least four channels. Each channel is capable of the performance of 3 Gb / s each way (total of 6 Gb / s per channel).
A third alternative is to use the SSD with PCI Express interface. A PCI Express interface with unidirectional data paths, and you receive is sent, each at 2.5 Gbps to 5 Gbps performance.
You can maximize the performance benefits of SSD technology with a careful selection of the appropriate interface.
In our world of information in their care, we are always looking for the next thing "big". It is often a new chip from Intel or AMD. However, in recent years, the microprocessor is not usually the limiting factor in computer performance.
Although the capacity of hard disk storage has increased significantly in recent years has remained relatively constant speed access. It is a question / problem is fundamental to technology. The hard drive is mechanical, and efforts to improve the speed have been diminishing returns.
A technology that competes with traditional hard disk drive (HDD) is the solid state drive (SSD). A SSD is not mechanically, based on the "flash memory", the same chip technology used to store pictures with your digital camera. A new SSD drive is only 3 years but not more.
An SSD can overcome conventional mechanical hard drives, because the 4X smaller and lighter, it is up to 50 times faster and is more reliable because there are no moving parts, produces less heat and consumes less energy. Disk capacity has improved SSD memory and 250 GB SSDs are now available. Currently, the disadvantage is the price.
SSDs are more expensive than conventional hard disk. An SSD drive now costs about $ 2 per gigabyte, while hard drive costs less than $ 1 per gigabyte. The price of one continues to improve SSD (SSD drives, once sold for more than $ 25 per gigabyte), and the anticipated volume of production, the price difference should be further reduced.
Flash memory is capable of a finite number of rewrites each memory cell (as conventional hard disks). Significant improvements in technology have emerged in recent years. In addition, Intel developed the "load leveling". This technique ensures that all memory cells in the SSD to receive a similar workload. Most SSD manufacturers are now using similar techniques. An SSD should last 10 years or more for the average user.
The main reason for the promising future of SSD is the access speed. A conventional hard drive has a fast access time equal to approximately 5 milliseconds. It sounds fast, but when the microprocessor is capable of millions of instructions per second (MIPS), 5 milliseconds is a bottleneck. SSD may have as few as 100 microsecond access time (50 times faster).
An important question when trying to use this capacity SSD speed is the potential bottleneck caused by the interface. There are 3 common interfaces used today with SSD.
The SATA interface is currently the most common interface used in conventional hard disk, but a SATA interface is limited in the total return, send and receive about 3 Gbps. This may be slow to SSD, which failures in performance. Some units are suitable for SSD performance of more than 5 Gbps.
Seagate Technology, in collaboration with AMD, has recently announced the Serial ATA storage interface for 6-Gbps SATA also called version 3.0, a next-generation technology capable of twice the speed of the faster SATA interface available today. This technology was demonstrated by conventional hard drives, but has an obvious application for the SSD market.
SAS (Serial Attached SCSI) is an alternative interface. SAS is a point in the technology by at least four channels. Each channel is capable of the performance of 3 Gb / s each way (total of 6 Gb / s per channel).
A third alternative is to use the SSD with PCI Express interface. A PCI Express interface with unidirectional data paths, and you receive is sent, each at 2.5 Gbps to 5 Gbps performance.
You can maximize the performance benefits of SSD technology with a careful selection of the appropriate interface.
Thursday, September 24, 2009
The Advantages of Intel
Here are my thoughts about the advantages of Intel.
Intel China Research Center is working on a model-based computing to optimize the use of its multi-core microprocessor technology. Tip, Microsoft is currently more in the virtualization software. It seems that virtualization is more related to server technology. The virtualization strategy with utility computing using virtual machines, and the third most important, the scalability of multi-core chip, and energy efficiency to achieve high workload consolidation in data centers.
Tera-scale computers based on 10 to 100s of integrated processor cores to 3 workload in the computer-based model or pattern recognition of objects in one database (source database mining identical or similar objects with patterns that match the target object find), and synthesis of information (data mine different models and objects together in a way that the user can digest, the user can obtain practical solutions), quoted by De vived and member of Intel.
Short side comparison, nuclear offers both Intel and AMD quad-core. You can see that the strategy of AMD is the weakness of the competitors as their power increases. AMD maintains that his superior, 2MB L3 cache, touted as better than any of its competitors, while competition with Intel in their previous performance. Intel is to stay away from the head to "play chicken" with AMD head by producing new products much faster than its closest competitors, although it lacks some innovative shots as a new L3 cache.
However, Intel more than offset by the improvement of microprocessors in other ways, such as the SSE4 instructions and more efficient materials such as silicon technology hafnium metal door. Intel Speed of having new products in the consumer market is the main reason is the market leader in microprocessors today. People generally want a new product that can be used now instead of waiting for a product a little better after a few months. AMD chance the new leader will come from its ability to do the same as Intel, not just talk the talk but walking the walk.
Dunnington 6-core Intel processors are the next in line to be launched in the consumer market. Users Dunnington microprocessor will own a piece of the level of computer technology Peta flop. The flop Peta computer technology, a computer calculates one trillion floating point per second, it exists in the Intel lab demonstration of a powerful computer that uses microprocessors PETA flop Dunnington.
It seems that in terms of marketing, is Intel's research and development arm to show the consumer the full capacity of the microprocessors. It is unlikely that an individual home user or purchased as 60 more pieces of microprocessors on a computer Dunnigton PETA flop building. However, the attraction that exists, and people go like "You know, I own an Intel 6-core microprocessor which the capabilities of the computer is peta flop!" Granted, it is a very attractive prospect!
Intel China Research Center is working on a model-based computing to optimize the use of its multi-core microprocessor technology. Tip, Microsoft is currently more in the virtualization software. It seems that virtualization is more related to server technology. The virtualization strategy with utility computing using virtual machines, and the third most important, the scalability of multi-core chip, and energy efficiency to achieve high workload consolidation in data centers.
Tera-scale computers based on 10 to 100s of integrated processor cores to 3 workload in the computer-based model or pattern recognition of objects in one database (source database mining identical or similar objects with patterns that match the target object find), and synthesis of information (data mine different models and objects together in a way that the user can digest, the user can obtain practical solutions), quoted by De vived and member of Intel.
Short side comparison, nuclear offers both Intel and AMD quad-core. You can see that the strategy of AMD is the weakness of the competitors as their power increases. AMD maintains that his superior, 2MB L3 cache, touted as better than any of its competitors, while competition with Intel in their previous performance. Intel is to stay away from the head to "play chicken" with AMD head by producing new products much faster than its closest competitors, although it lacks some innovative shots as a new L3 cache.
However, Intel more than offset by the improvement of microprocessors in other ways, such as the SSE4 instructions and more efficient materials such as silicon technology hafnium metal door. Intel Speed of having new products in the consumer market is the main reason is the market leader in microprocessors today. People generally want a new product that can be used now instead of waiting for a product a little better after a few months. AMD chance the new leader will come from its ability to do the same as Intel, not just talk the talk but walking the walk.
Dunnington 6-core Intel processors are the next in line to be launched in the consumer market. Users Dunnington microprocessor will own a piece of the level of computer technology Peta flop. The flop Peta computer technology, a computer calculates one trillion floating point per second, it exists in the Intel lab demonstration of a powerful computer that uses microprocessors PETA flop Dunnington.
It seems that in terms of marketing, is Intel's research and development arm to show the consumer the full capacity of the microprocessors. It is unlikely that an individual home user or purchased as 60 more pieces of microprocessors on a computer Dunnigton PETA flop building. However, the attraction that exists, and people go like "You know, I own an Intel 6-core microprocessor which the capabilities of the computer is peta flop!" Granted, it is a very attractive prospect!
Wednesday, September 23, 2009
Battery Hazards
Here are my thoughts about battery hazards.
As batteries are energy storage devices, they are prone to make many threats to human life and safety. A short circuit is one of the common battery perils. The most important reason for short circuits is overcharging or over discharging. Other causes for cell short circuits include faulty separators, aggregation of lead particles or other metals between both the plates, buckling of the plates and excessive sediments in the bottom of the jar.
Another battery hazard is the generation of gasses. "Battery gassing" is a normal product of charging. Passage of electricity through water dissociates the water into hydrogen and oxygen. These are the gases that emanate from an open cell battery. When hydrogen reaches an intensity of 4% in air, it can be explosive. Therefore, it is essential that the area is well ventilated and there is no chance of open flame.
High-power lithium cells should be maintained with extreme care because a short circuit can lead to internal overheating thereby making an explosion or battery rupture. These lithium cells are more sensitive to physical stress than alkaline batteries and are commonly found in today's cellular phones. Electrical burns, strains, and sprains are some of the common hazards that arise when servicing, charging, or jumping the common lead-acid battery. Lead-acid batteries can also cause danger when the acid spills out. For these types of batteries, the occurrence of short circuit while replacing can be minimized by disconnecting the earth lead first and replacing them last. One way to reduce battery hazards in a vehicle is to switch off all the vehicle electrical equipment before the charger leads are removed from the vehicle.
As batteries are energy storage devices, they are prone to make many threats to human life and safety. A short circuit is one of the common battery perils. The most important reason for short circuits is overcharging or over discharging. Other causes for cell short circuits include faulty separators, aggregation of lead particles or other metals between both the plates, buckling of the plates and excessive sediments in the bottom of the jar.
Another battery hazard is the generation of gasses. "Battery gassing" is a normal product of charging. Passage of electricity through water dissociates the water into hydrogen and oxygen. These are the gases that emanate from an open cell battery. When hydrogen reaches an intensity of 4% in air, it can be explosive. Therefore, it is essential that the area is well ventilated and there is no chance of open flame.
High-power lithium cells should be maintained with extreme care because a short circuit can lead to internal overheating thereby making an explosion or battery rupture. These lithium cells are more sensitive to physical stress than alkaline batteries and are commonly found in today's cellular phones. Electrical burns, strains, and sprains are some of the common hazards that arise when servicing, charging, or jumping the common lead-acid battery. Lead-acid batteries can also cause danger when the acid spills out. For these types of batteries, the occurrence of short circuit while replacing can be minimized by disconnecting the earth lead first and replacing them last. One way to reduce battery hazards in a vehicle is to switch off all the vehicle electrical equipment before the charger leads are removed from the vehicle.
Monday, September 21, 2009
Circuit Breaker Trips
Here are my thoughts about circuit breaker trips.
Switches for a journey of two reasons, a short circuit or a circuit overload. The short circuit is easier to explain and repair the most difficult to identify and declare an overloaded circuit is relatively easy to solve and easier to use.
A switch is designed to adjust the amount of current a wire to make sure. Therefore, most 110-volt lines in your home with 12 Gage wires are wired, and placed on a 20 amp circuit breaker. Maybe your house on May 14 Gage wire be wired and a 15 amp circuit breaker. You could blow a 15 amp circuit breaker at 12, a pro-Gage, but you can never be a place 20 A switch to 14 Gage wire.
You see, wire has a rated current capacity that can carry and 12/20, and 14.15 is the maximum for each circuit. This is what is violated when a trip to Circuit Breaker.
Ina short-circuit the hot wire is broken or may be just enough to take the insulation to make contact with the ground. When this happens causing a direct short, the current increase, the switch and when the current exceeds the rating on the switch for travel switch. If you try to set the option will immediately drive away. Remedying this situation requires a person with knowledge of electrical or hire an electrician. Electricity is dangerous, so do not play. It takes less than one amp to kill someone.
The other reason a circuit breaker trips, the road to reduce congestion. As I indicated, a circuit is a circuit breaker to protect the wire is served. If it is 12/20 then 20 amps is the maximum for the track. So, you plug in a hair dye that rated at 1500 watts and you decide to have more heating the 1500-watt curling iron. Now there is a simple calculation watts divided by voltage amplifiers. So 3000/120 = 25amps. The route is congested and travel. Connect one item at a time or to a different circuit for the curling iron!
Switches for a journey of two reasons, a short circuit or a circuit overload. The short circuit is easier to explain and repair the most difficult to identify and declare an overloaded circuit is relatively easy to solve and easier to use.
A switch is designed to adjust the amount of current a wire to make sure. Therefore, most 110-volt lines in your home with 12 Gage wires are wired, and placed on a 20 amp circuit breaker. Maybe your house on May 14 Gage wire be wired and a 15 amp circuit breaker. You could blow a 15 amp circuit breaker at 12, a pro-Gage, but you can never be a place 20 A switch to 14 Gage wire.
You see, wire has a rated current capacity that can carry and 12/20, and 14.15 is the maximum for each circuit. This is what is violated when a trip to Circuit Breaker.
Ina short-circuit the hot wire is broken or may be just enough to take the insulation to make contact with the ground. When this happens causing a direct short, the current increase, the switch and when the current exceeds the rating on the switch for travel switch. If you try to set the option will immediately drive away. Remedying this situation requires a person with knowledge of electrical or hire an electrician. Electricity is dangerous, so do not play. It takes less than one amp to kill someone.
The other reason a circuit breaker trips, the road to reduce congestion. As I indicated, a circuit is a circuit breaker to protect the wire is served. If it is 12/20 then 20 amps is the maximum for the track. So, you plug in a hair dye that rated at 1500 watts and you decide to have more heating the 1500-watt curling iron. Now there is a simple calculation watts divided by voltage amplifiers. So 3000/120 = 25amps. The route is congested and travel. Connect one item at a time or to a different circuit for the curling iron!
Wednesday, September 2, 2009
How To Program The PIC
Here are my thoughts on how to program the PIC.
There are three ways to program a PIC microcontroller
1. Using normal programming hardware (high voltage programming HVP).
2. Low Voltage Programming (LVP).
3. Boot Loading.
The first two methods use the programming port of PIC microcontrollers labeled ICSP (In Circuit Serial).
This port is shared between the existing pins after programming of microcontrollers and pin back to the normal operation of the microcontroller.
Note: To work your ICSP effects and consider the requirements of the programmer, for example ICSP HPV is a high voltage on the Vpp pin (the circuit must be capable of high voltage - 13V to handle). The burden of other signs of PGC PGD and may not be too high not to one of these pens LED 20mA - if not the tension level high enough at the entrance of the PIC for programming.
It is relatively easy to design for ICSP through the use of insulation resistance for the normal channels and not using heavy loads on these pins.
ICSP provides 6 connections from the pic ICSP programmer to the board as follows:
VPP - (o MCLRn) programming voltage (typically 13V).
Vcc - Power (usually 5V).
GND Ground (zero volts).
DGP - Data Port and connection RB7 custom.
PGC - Clock usual connection port RB6.
PGM - LVP is habit and RB3/RB4 port connection.
PIC Micro: High V programming
To use the first method of a hardware interface that is required or a PIC programmer "to the interface between the programming software (usually running on the PC) and the PIC chip. This is the hardware information from the PC via one of three of the interfaces:
* RS232 COM port
* Parallel port
* The USB port
You choose the interface you want, and then choose a suitable PIC programmer. The PC communicates with the hardware generation of the series (ICSP) signals to the PIC hex file translate into a serial data stream suitable for the target microcontroller.
Note: Almost all PIC microcontrollers using the ICSP interface, so once you have HPV can program virtually any PIC microcontroller. For example, you can program 12F675, 16F84, 16F88, 16F877 (A), 18F2550, 18F452, etc
There are several programs for programming PIC eg ICPROG monkeys and many different hardware developers.
PIC Micro: Low-voltage programming (LVP)
LVP is exactly the same as HVP except:
* The Vpp voltage is set to the normal voltage.
* The PGM pin, the programming mode.
Note: In this mode you can not use the PIN-code of the PGM for something else that is dedicated solely to LVP control.
Devices are manufactured with PGM mode enabled and the only way to PGM mode to disable the program that a developer of HPV applications.
Note: Some PIC microcontrollers can only method of HPV, used as the LVP method you must sacrifice a pin - PGM - (to tell the PIC Micro either that it is programmed (high volts eg 5V) or not programmed (0 V)) and some PIC micros have only 8 pins eg 12F675. For this chip the PGM pin is not available for HPV is the only way.
The real advantage of using the LVP mode is that you can plan several Micros PIC on a board without that each individual program - could be one extra daisy chain each master micro micro than the agenda of any one turn - and This is only possible from the Vpp signal is a normal level of logic in LVP mode.
PIC Micro: Boat Loading
Loading Boot uses any available interface to a program to load the program memory. It requires a bootstrap program interface to the data to interpret and translate into instructions of program memory.
Note: Note: only new devices that are able to program your own memory can use this method.
Normally, a serial port for boot loading and PIC microcontroller program will start waiting for a time after listening to the serial port of a reserved word that tells the boot program to start is to listen sequence of characters that normally not be used in the interface
Once you get this order, starting mode is a hex-file is passed to the microcontroller interface. He interprets this and programs the memory of the microcontroller and then starts the program.
There are two problems with this method:
1. You have to program the boot code using HVP or LVP.
2. Use one of the resources of the microcontroller.
Once programmed it offers a convenient way to use the device if it is not necessary hardware and programming an important advantage is that you can reprogram a device without the example of bodies, if you boxed project teams can still return to program the serial port!
There are three ways to program a PIC microcontroller
1. Using normal programming hardware (high voltage programming HVP).
2. Low Voltage Programming (LVP).
3. Boot Loading.
The first two methods use the programming port of PIC microcontrollers labeled ICSP (In Circuit Serial).
This port is shared between the existing pins after programming of microcontrollers and pin back to the normal operation of the microcontroller.
Note: To work your ICSP effects and consider the requirements of the programmer, for example ICSP HPV is a high voltage on the Vpp pin (the circuit must be capable of high voltage - 13V to handle). The burden of other signs of PGC PGD and may not be too high not to one of these pens LED 20mA - if not the tension level high enough at the entrance of the PIC for programming.
It is relatively easy to design for ICSP through the use of insulation resistance for the normal channels and not using heavy loads on these pins.
ICSP provides 6 connections from the pic ICSP programmer to the board as follows:
VPP - (o MCLRn) programming voltage (typically 13V).
Vcc - Power (usually 5V).
GND Ground (zero volts).
DGP - Data Port and connection RB7 custom.
PGC - Clock usual connection port RB6.
PGM - LVP is habit and RB3/RB4 port connection.
PIC Micro: High V programming
To use the first method of a hardware interface that is required or a PIC programmer "to the interface between the programming software (usually running on the PC) and the PIC chip. This is the hardware information from the PC via one of three of the interfaces:
* RS232 COM port
* Parallel port
* The USB port
You choose the interface you want, and then choose a suitable PIC programmer. The PC communicates with the hardware generation of the series (ICSP) signals to the PIC hex file translate into a serial data stream suitable for the target microcontroller.
Note: Almost all PIC microcontrollers using the ICSP interface, so once you have HPV can program virtually any PIC microcontroller. For example, you can program 12F675, 16F84, 16F88, 16F877 (A), 18F2550, 18F452, etc
There are several programs for programming PIC eg ICPROG monkeys and many different hardware developers.
PIC Micro: Low-voltage programming (LVP)
LVP is exactly the same as HVP except:
* The Vpp voltage is set to the normal voltage.
* The PGM pin, the programming mode.
Note: In this mode you can not use the PIN-code of the PGM for something else that is dedicated solely to LVP control.
Devices are manufactured with PGM mode enabled and the only way to PGM mode to disable the program that a developer of HPV applications.
Note: Some PIC microcontrollers can only method of HPV, used as the LVP method you must sacrifice a pin - PGM - (to tell the PIC Micro either that it is programmed (high volts eg 5V) or not programmed (0 V)) and some PIC micros have only 8 pins eg 12F675. For this chip the PGM pin is not available for HPV is the only way.
The real advantage of using the LVP mode is that you can plan several Micros PIC on a board without that each individual program - could be one extra daisy chain each master micro micro than the agenda of any one turn - and This is only possible from the Vpp signal is a normal level of logic in LVP mode.
PIC Micro: Boat Loading
Loading Boot uses any available interface to a program to load the program memory. It requires a bootstrap program interface to the data to interpret and translate into instructions of program memory.
Note: Note: only new devices that are able to program your own memory can use this method.
Normally, a serial port for boot loading and PIC microcontroller program will start waiting for a time after listening to the serial port of a reserved word that tells the boot program to start is to listen sequence of characters that normally not be used in the interface
Once you get this order, starting mode is a hex-file is passed to the microcontroller interface. He interprets this and programs the memory of the microcontroller and then starts the program.
There are two problems with this method:
1. You have to program the boot code using HVP or LVP.
2. Use one of the resources of the microcontroller.
Once programmed it offers a convenient way to use the device if it is not necessary hardware and programming an important advantage is that you can reprogram a device without the example of bodies, if you boxed project teams can still return to program the serial port!
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