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PIC18 PROGRAMMING
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Like the PIC17, the PIC18 has the capability to self program using the table read and write instructions. In the PIC18, this capability is not only available within applications, but is used to program the device right from the start without the need for specialized boot ROM or ICSP interface code, unlike the PIC17. Programming the PIC18 microcontrollers can be accomplished by applying either a high or low voltage on the _MCLR pin (and, optionally, the LVP pin) and a clock and data line as in mid-range ICSP programming. The programming sequence is actually quite a bit more complicated than in the other device families, but it allows you to reprogram blocks of code fairly easily, something that the other families do not provide. To program the PIC18, instructions are downloaded into the PIC microcontroller after setting the _MCLR pin to Vpp (13 14V, as in the other EPROM PIC microcontrollers). Passing instructions (which contain the program data) to the PIC microcontroller is accomplished by rst sending a 4-bit special instruction followed by an optional 16-bit instruction. The 4-bit special instruction is sent most signi cant bit rst and can either specify that an instruction follows or that it is a mnemonic for a TBLRD or TBLWT instruction as shown in Table 4.7. The data transmission looks like Fig. 4.13 with a 4-bit nop instruction operation code transmitted rst, followed by the 16-bit instruction, which is then executed. If the operation is to be a table read or write operation, then the Operation Instruction code is used
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PROGRAMMING PIC MICROCONTROLLERS
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TABLE 4.7 SPECIAL INSTRUCTION
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PIC18 PROGRAMMING MNEMONICS INSTRUCTION OPERATION
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0000 0010 1000 1001 1010 1011 1100 1101 1110 1111
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Shift in and execute next instruction Shift out TABLAT register
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TBLRD * TBLRD * TBLRD * TBLRD TBLWT * TBLWT * TBLWT * TBLWT *, PROG *
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Read table Read table, increment TBLPTR Read table, decrement TBLPTR Increment TBLPTR, read table Write table Write table, Increment TBLPTR Write table, decrement TBLPTR Write table, start programming
2 2 2 2 2 2 2 2
Figure 4.13 The serial instruction timing for sending one instruction that will be executed in the PIC18 microcontroller core.
PIC ICSP PROGRAMMER INTERFACE
The TBLWT (table write) instruction sequence.
instead of the nop to simplify the data transfer; in the case of a table write, the 16 bits of the word to be burned into program memory are sent as shown in Fig. 4.14. If a readback of the table contents is required, the data is shifted out of the PIC microcontroller. To set up a table read or write in Flash devices, the internal PIC programming registers must be initialized. The programming write operation is controlled using the EECON1 register and the EEPGD and CFGS bits using the following two instructions:
Mnemonic nop nop Instruction/Data bsf EECON1, EEPGD bsf EECON1, CFGS
These two instructions only have to be executed before the start of the programming operation. They do not have to be repeated each time data is written sequentially to the PIC18 microcontroller. Next the TBLPTR has to be initialized. This is done using standard movlw and movwf instruction. For example, to program address 0x12345 with the value 0x6789, the following data sequence is written to the PIC18:
Mnemonic nop nop nop nop nop nop tblwt * nop Instruction/Data movlw UPPER 0x12345 movwf TBLPTRU movlw (0x12345 >> 8) & 0xFF movwf TBLPTRH movlw LOW 0x12345 movwf TBLPTRL 0x6789 CLOCKHIGH
PROGRAMMING PIC MICROCONTROLLERS
The nal nop mnemonic and CLOCKHIGH are used to program in the data. After sending the 4-bit nop mnemonic, the programming clock line is held high for 1 ms (known in the datasheets as the P9 programming time). Up to four instructions (8 bytes in total), which is known as a panel, can be written at a time before the programming instruction TABWT is executed. Normally, this is accomplished using the TABWT *+ mnemonic in which the table pointer is incremented by two after the 16 bits are written. At the end of the sequence the TABWT * mnemonic is executed, which starts the writing sequence:
Mnemonic nop nop nop nop nop nop tblwt *+ tblwt *+ tblwt *+ tblwt * nop Instruction/Data movlw UPPER StartAddress movwf TBLPTRU movlw (StartAddress >> 8) & 0xFF movwf TBLPTRH movlw LOW StartAddress movwf TBLPTRL Word0 Word1 Word2 Word3 CLOCKHIGH
Erasing the entire program and data memory of the chip is accomplished using the erase options listed in Table 4.8 and sending the data byte to address 0x3C0004 using the programming sequence:
Mnemonic nop nop nop Instruction/Data movlw UPPER 0x3C0004 movwf TBLPTRU movlw (0x3C0004 >> 8) & 0xFF
TABLE 4.8 BULK ERASE OPTIONS AVAILABLE IN THE FLASH-BASED PIC18 MICROCONTROLLERS OPTION DESCRIPTION DATA
Chip Erase Erase Data EEPROM Erase Boot Block Erase Block 0 Erase Block 1 Erase Block 2 Erase Block 3
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