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TABLE 4.4 PIN
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PIN SELECTIONS FOR PIC MICROCONTROLLER DEVICES 8-PIN DIP 14-PIN DIP 18-PIN DIP 28-PIN DIP 40-PIN DIP
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Vpp Vdd ( Voltage)
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4 _MCLR 1 8 7 GP0 6 GP1
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4 _MCLR 1 14 13 RB0 12 RB1
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4 _MCLR 14 5 13 RB7 12 RB6
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Programmer Vpp Voltage Supply.
to shift up the regulator s ground reference, as I show in Figure 4.9. The two diodes will shift up the GND reference by 0.7V due to the pin junction voltage. This shift will pull up the 78L12 s output to allow the PIC microcontroller to go into programming mode. Vdd is at 5V and requires 20 50 mA. That means either a 78L05 or a Zener diode regulator like I use in the EL Cheapo can be used for supplying power to the PIC microcontroller being programmed. PNP bipolar transistor switches can be used for turning on and off the Vpp and Vdd voltages. If Vpp is not being driven, internal pull-downs in the PIC microcontroller will pull its _MCLR pin to ground, which eliminates the need for a ground driver on the reset line. Putting the PIC microcontroller into programming mode is accomplished using the waveform shown in Fig. 4.10. When _MCLR is driven to Vpp, the internal program counter of the PIC microcontroller is reset. The PIC microcontroller s program counter is used to keep track of the current program memory address in the EPROM that is being programmed. When programming different PIC microcontroller families, the address and how to access the con guration fuse registers must be known. For example, to program the con guration fuses of the mid-range chips, the programmer must issue a load con guration command, which sets the program counter to 0x2000, and then increment it seven times to get to address 0x2007, which is where the PIC MCU s con guration fuses reside. Data is passed to and from the PIC microcontroller using a synchronous data protocol. A 6-bit command is always sent before data is transferred. For many devices, the commands (and their bit values and data) listed in Table 4.5 are used.
ICSP programmer initialization.
PIC ICSP PROGRAMMER INTERFACE
TABLE 4.5 COMMAND
EPROM PROGRAM MEMORY ICSP PROGRAMMING COMMANDS BIT PATTERN DATA COMMENTS
LoadData
0b000010
0, 14 bits, 0
Load word for programming. Multiply data value by 2 before sending to PIC MCU. Low-end architectures (12 bits) also multiply the instruction code by 2 and leave the top 3 bits zeroed out. Start programming cycle. End programming cycle after preset period of time. Increment the PIC microcontroller s PC. Read instruction from PIC MCU s program pemory. Read Load Data comments for low-end instructions. Set the mid-range device s program counter to 0x2000.
BeginProgramming EndProgramming IncrementAddress ReadData
0b001000 0b001110 0b000110 0b000100
None None None 0, 14 bits, 0
LoadCon g
0b000000
0x7FFE
Data is shifted in and out of the PIC microcontroller using a synchronous protocol. Data is shifted out least signi cant bit rst on the falling edge of the clock line. The minimum period for the clock is 200 ns with the data bit centered as shown in Fig. 4.11, which is sending an IncrementAddress command. When data is to be transferred, the same protocol is used, but a 16-bit transfer (LSB rst) follows after 1 s has passed since the transmission of the command. The 16 bits consist of the instruction word shifted to the left by one. This means the rst and last bits of the data transfer are always 0. Before programming of a PIC microcontroller with EPROM program memory can start, the program memory should be checked to make sure it is blank. This is accomplished by simply reading the program memory (ReadData command listed in Table 4.5) and comparing the data returned to 0x07FFE. After every compare, the PIC
ICSP programmer 6-bit command.
PROGRAMMING PIC MICROCONTROLLERS
microcontroller s program counter is incremented (using the IncrementAddress command) to the size of the device s program memory. Once the program memory is checked, the program counter is jumped to 0x02000 (using the LoadCon guration command) and then the next eight words are checked for 0x07FFE. To program an EPROM program memory instruction word, a LoadData command (followed by the instruction value) is sent to the PIC microcontroller followed by a BeginProgramming command. After at least 100 ms has passed, an EndProgramming command is sent. This sequence is known as a programming cycle. After each programming cycle, the contents are read back and compared to the expected value. This process is repeated up to 25 times or until the program memory is correct. If the program memory is correct, then three times the number of programming cycles needed to get the correct value are executed to ensure the instruction word is not marginally programmed. This will be a bit confusing; consider, for example, a PIC microcontroller program memory word that requires four programming cycles before the correct data is returned. After the correct data has been returned, an additional 12 programming cycles (three times the four cycles) are sent to the PIC MCU. Once a memory location has been correctly programmed, the PIC microcontroller s program counter can be incremented. If there is nothing to program at a memory location, or the value is 0x03FFF, then you can simply send an IncrementAddress command to skip to the next address and ignore programming the instruction completely. The con guration registers and ID locations are programmed the same way after sending a LoadCon guration command after the program memory has been loaded and its contents veri ed against the expected program. By doing this, if there are any protection bits enabled in the con guration fuses, they won t affect the programming of the chip. The process for burning a PIC microcontroller s program memory could be blocked out with the pseudocode:
ICSPProgram() { int PC = 0; int i, i j k; int retvalue = 0; // // // Program to be burned in is in an array of addresses and data PIC microcontroller s program counter
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