PIC Instruction Set:
PIC is RISC based architecture supporting only 35 instructions. These instructions can be classified in the following categories:
1. Register File Operations:
Byte oriented operations
Bit oriented operations
Literal and control operations
2. Based on Functions
Data Transfer Operations
Arithmetic Operations
Logical Operations
Shift and Rotate
Branch and Return
These instructions are shown in the
|
Byte-Oriented Operations |
||||
| Mnemonic | Description | Cycles | 14-bit OPCode | Status Affected |
| ADDWF f,d | Add W and F | 1 | 0 0111 dfff ffff | C, DC, Z |
| ANDWF f,d | Logical AND W with f | 1 | 000101 dfff ffff | Z |
| CLRF f | Clear f | 1 | 0000011fff ffff | Z |
| CLRW | Clear W | 1 | 00 0001 0xxx xxxx | Z |
| COMF f,d | Complement f | 1 | 00 1001 dfff ffff | Z |
| DECF f,d | Decrement f | 1 | 00 0011 dfff ffff | Z |
| DECFSZ f,d | Decrement f and skip if zero | 1(2) | 00 1011 dfff ffff | |
| INCF f,d | increment | 1 | 00 1010 dfff ffff | Z |
| INCFSZ f,d | Increment f, and skip if zero | 1(2) | 00 1111 dfff ffff | |
| IORWF f,d | Inclusive OR W with f | 1 | 00 0100 dfff ffff | Z |
| MOVF f,d | Move f | 1 | 00 1000 dfff ffff | Z |
| MOVWF f | Move W to f | 1 | 00 0000 1fff ffff | |
| NOP | 1 | 00 0000 0xx0 0000 | ||
| RLF f,d | Rotate Left through carry | 1 | 00 1101 dfff ffff | C |
| RRF f,d | Rotate right through carry | 1 | 00 1100 dfff ffff | C |
| SUBWF f,d | Subtract W from f | 1 | 00 0010 dfff ffff | C, DC, Z |
| SWAPF f,d | Swap nibbles in f | 1 | 00 1110 dfff ffff | |
| XORWF f,d | EXCLUSIVE or | 1 | 00 0110 dfff ffff | Z |
***If ‘d’ is 0, the result is stored in the W register. If ‘d’ is 1, the result is stored back in register ‘f’.***
| Bit-Oriented File Register Operations | ||||
| BCF f, b | Bit Clear f | 1 | 01 00bb bfff ffff | |
| BSF f, b | Bit Set f | 1 | 01 01bb bfff ffff | |
| BTFSC f, b | Bit Test f, Skip if Clear | 1(2) | 01 10bb bfff ffff | |
| BTFSS f, b | Bit Test f, Skip if Set | 1(2) | 01 11bb bfff ffff | |
| Literal and Control Operations | ||||
| ADDLW k | Add literal and W | 1 | 11 111x kkkk kkkk | C, DC, Z |
| ANDLW k | AND literal with W | 1 | 11 1001 kkkk kkkk | Z |
| CALL k | Call subroutine | 2 | 10 0kkk kkkk kkkk | |
| CLRWDT – | Clear Watchdog Timer | 1 | 00 0000 0110 0100 | TO’, PD’ |
| GOTO k | Go to address | 2 | 10 1kkk kkkk kkkk | |
| IORLW k | Inclusive OR literal with W | 1 | 11 1000 kkkk kkkk | Z |
| MOVLW k | Move literal to W | 1 | 11 00xx kkkk kkkk | |
| RETFIE – | Return from interrupt | 2 | 00 0000 0000 1001 | |
| RETLW k | Return with literal in W | 2 | 11 01xx kkkk kkkk | |
| RETURN | Return from Subroutine | 2 | 00 0000 0000 1000 | |
| SLEEP | Go into standby mode | 1 | 00 0000 0110 0011 | TO’, PD’ |
| SUBLW k | Subtract W from literal | 1 | 11 110x kkkk kkkk | C, DC, Z |
| XORLW k | Exclusive OR literal with W | 1 | 11 1010 kkkk kkkk | Z |