PIC Instruction Set Summary

Notation:

fr: one of the 80 memory ram positions implemented as 8 bit registers (File Register Set or FRS) (0 =< fr <= 4f). The first 12 are special purpose registers (SFR) and the other 68 are general purpose registers(GPR).

W: 8 bit accumulator of the Arithmetic Logic Unit (ALU) d: mnemonic for the destination of one operation, which can be 1 ( a file

register f) or 0 (the accumulator w) k: an 8 bit literal b: 3 bit literal identifying one bit of a byte (0: least significant bit, 7: most

significant bit). Example: f(7) addr: 11 bit literal representing an instruction address C: Carry bit = STATUS(0) Z: Zero bit = STATUS(2) DC: Digit Carry bit = STATUS(1) opr: mnemonic for one of the following binary operations:

o add - additiono sub - subtractiono and - logical ando ior - logical oro xor - exclusive or

 

1. Copy value from/to file register or literal to/from wMnemonic Description Status Function Obs

movf fr, d Move file register Z fr => dsee macro: mov f, d

movwf   fr Move W to file register w => frmacro: mov w, fr

movlw   k Move literal to W k => Wmacro: movl k, w

 

2. Logic / arithmetic instructions with a file register and wMnemonic Description Status Function Obs

oprwf   fr,dlogic / arithmetic operation with a file register and W

Z(all),C,DC (add,sub)

fr opr W => d

only add, sub affect C,DCmacro: opr fr, d

 

3. Logic / arithmetic instructions with a literal and wMnemonic Description Status Function Obs

oprlw   klogic / arimetic operationwith a literal and W

Z(all),C,DC (add,sub)

k opr W => W

only add, sub affect C,DC macro:oprl k,w

 

4. One operand logic / arithmetic instructionsMnemonic Description Status Function Obs

clrw Clear accumulator W Z 0 => W

clrf   fr Clear file register fr Z 0 => fr

decf  fr,d Decrement file register fr Z fr - 1 => d

incf  fr, d Increment file register fr Z fr + 1 => d

comf fr,d1's complement file register fr

Z not fr => d

rlf  fr, dRotate file register fr left thru C

CC <= fr(7), fr(i) <= fr(i-1), fr(0) <= C

rrf   fr, dRotate file register fr right thru C

CC => fr(7), fr(i) => fr(i-1), fr(0) => C

bcf   fr, b Bit clear on file register fr 0 => fr(b)

bsf   fr, b Bit set on file register fr 1 => fr(b)

swapf  fr,d swap halves of fr(fr(0:3) <=> fr(4:7)) => d

nop No operation

 

5. Branch, Skip and Call instructionsMnemonic Description Status Function Obs

goto    addr branch to addr addr => PC(0:10)

call    addr call routine at addrPC => TOSaddr => PC(0:10)

decfsz fr,d Decrement fr, skip if zero fr - 1 => d, skip if 0

incfsz fr,dIncrement fr, skip next instr if zero

fr + 1 => d, skip next instr if 0

btfsc fr,b Bit test fr, skip if clearskip next instr if fr(b) =0

btfss fr,b Bit test fr, skip if setskip next instr if fr(b)=1

return return from subroutine TOS => PC

retlw   k return with literal in w k =>w,   TOS => PC

retfie return from interruptTOS => PC,    1 => GIE

 

6. Buit-in macros for commonly used logic / arithmetic operationsMnemonic Description Status Function Obs

addcf fr, d Add carry to fr Z btfsc   3, 0   incf  f,d

subcf fr, d Subtract carry from fr Zbtfsc   3, 0   decf  fr,d

negf fr, d Negate file register fr Zcomf   fr, 1   incf  fr,d

b   addr Branch to addr goto    adddr

bz   addr Branch on Zero to addrbtfsc   3, 2    goto addr

bnz   addrBranch on No Zero to addr

btfss   3, 2    goto addr

bc   addrBranch on Carry to addr

btfsc   3, 0    goto addr

bnc   addrBranch on No Carry to addr

btfss   3, 0    goto addr

skpc Skip on Carry btfss   3, 0

skpnc Skip on No Carry btfsc   3, 0

skpz Skip on Zero btfss   3, 2

skpnz Skip on No Zero btfsc   3, 2

clrz Clear Zero flag bcf    3, 2

setz Set Zero flag bsf    3, 2

clrc Clear Carry flag bcf    3, 0

setc Set Carry flag bsf    3, 0

tstf   fr Test file register fr Z movf  fr, f

xchg fr1, fr2Exchange file regs fr1 & fr2

Z

movf fr2, 0 xorwf  fr1,1xorwf fr1, 0  xorwf  fr1, 1movwf fr2

Macro uses only w as temporary variableSee:mymacros.inc

decbnz fr,addrDecrement file register,if # 0 branch to addr

decfsz  frgoto addr

In:mymacros.inc

Copyright © Célio Guimarães