prepared by : Maher AL-Omari

Logic instructionsLogic instructionsANDORXORComplement

ANDORXORComplementRotateswappingRotateswapping

affect bit Z

affects bit C

does not affect any

prepared by : Maher AL-Omari

ANDWF f,dANDWF f,d

Syntax: [ label ] ANDWF f,d Operands: 0 f 127 d [0,1] Operation: (W) . (f) (destination)Description: And the contents of the W register

with register f. If d is 0, the result is stored in the W register. If d is 1, the result is stored back in register f.

Syntax: [ label ] ANDWF f,d Operands: 0 f 127 d [0,1] Operation: (W) . (f) (destination)Description: And the contents of the W register

with register f. If d is 0, the result is stored in the W register. If d is 1, the result is stored back in register f.

prepared by : Maher AL-Omari

ANDLW kANDLW k

Syntax: [ label ] ANDLW K Operands: 0 k 255

Operation: (W) . k (W)Description: And the contents of the W register

with k. the result is stored in the W register.

Syntax: [ label ] ANDLW K Operands: 0 k 255

Operation: (W) . k (W)Description: And the contents of the W register

with k. the result is stored in the W register.

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Bit maskingBit masking

10100100W=25h

10100101w=A5h

D0D1D2D3D4D5D6D7

ANDLW 3fANDLW 3f

( ( Z = 0Z = 0, ), )

00 00 11 11 11 11 11 11

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IORWF f,dIORWF f,d

Syntax: [ label ] IORWF f,d Operands: 0 f 127 d [0,1] Operation: (W) OR (f) (destination)Description: OR the contents of the W register with register f.

If d is 0, the result is stored in the W register. If d is 1, the result is stored back in register f.

Syntax: [ label ] IORWF f,d Operands: 0 f 127 d [0,1] Operation: (W) OR (f) (destination)Description: OR the contents of the W register with register f.

If d is 0, the result is stored in the W register. If d is 1, the result is stored back in register f.

prepared by : Maher AL-Omari

IORLW kIORLW k

Syntax: [ label ] IORLW k Operands: 0 k 255

Operation: (W) OR k (W)Description: OR the contents of the W register

with register k. The result is stored in the W register.

Syntax: [ label ] IORLW k Operands: 0 k 255

Operation: (W) OR k (W)Description: OR the contents of the W register

with register k. The result is stored in the W register.

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Logical OR-ing is used to set selected bitsLogical OR-ing is used to set selected bits

11110111

11000111W=E3

D2D3

IORLWIORLW 0C

EFHEFH00 00 00 00 11 11 00 00

((Z = 0Z = 0,) ,)

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XORWF f,dXORWF f,d

Syntax: [ label ] XORWF f,d Operands: 0 f 127 d [0,1] Operation: (W) xOR (f) (destination)Description: XOR the contents of the W register

with register f. If d is 0, the result is stored in the W register. If d is 1, the result is stored back in register f.

Syntax: [ label ] XORWF f,d Operands: 0 f 127 d [0,1] Operation: (W) xOR (f) (destination)Description: XOR the contents of the W register

with register f. If d is 0, the result is stored in the W register. If d is 1, the result is stored back in register f.

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XORLW kXORLW k

Syntax: [ label ] XORLW k Operands: 0 k 255

Operation: (W) xOR k (W)Description: XOR the contents of the W register

with register k. The result is stored in the W register.

Syntax: [ label ] XORLW k Operands: 0 k 255

Operation: (W) xOR k (W)Description: XOR the contents of the W register

with register k. The result is stored in the W register.

prepared by : Maher AL-Omari

Complementing certain bitsComplementing certain bits

10100110W=65h

10100101w=A5h

D0D1D2D3D4D5D6D7

XORLW C0XORLW C0

( ( Z = 0Z = 0, ), )

11 11 00 00 00 00 00 00

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Example 3:using arithmetic instructions

addlw 1

addlw 0xff

xorlw 0xff

xorlw 0xffaddlw 1

andlw 0xf0

iorlw 0x0f

Increment W:

Decrement W:

Logic negation (1-complement):

2-complement for W:

Mask bits 3, 2, 1, 0:

Set 3, 2, 1,0:

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Two complement subtraction

movf reg1,0xorlw 0xffaddlw 0x01Addwf reg2,0Movwf reg3

movf reg1,0xorlw 0xffaddlw 0x01Addwf reg2,0Movwf reg3

Reg3=reg2-reg1

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Syntax: [ label ] COMF f,d Operands: 0 f 127

d [0,1]

Operation: (f) (destination) Status Affected: zDescription: The contents of register f are complemented. If d is

0, the result is stored in W. If d is 1,the result is stored back in register f

Syntax: [ label ] COMF f,d Operands: 0 f 127

d [0,1]

Operation: (f) (destination) Status Affected: zDescription: The contents of register f are complemented. If d is

0, the result is stored in W. If d is 1,the result is stored back in register f

COMF f,dCOMF f,d

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Syntax: [ label ] RLF f,d Operands: 0 f 127

d [0,1] Operation: Status Affected: cDescription: The contents of register f are rotated one bit to the

left through the Carry flag. If d is 0, the result is placed in the W register. If d is 1, the result is placed

back in register f

Syntax: [ label ] RLF f,d Operands: 0 f 127

d [0,1] Operation: Status Affected: cDescription: The contents of register f are rotated one bit to the

left through the Carry flag. If d is 0, the result is placed in the W register. If d is 1, the result is placed

back in register f

RLF f,dRLF f,d

D7 D0C

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Given Reg2 =96 & the carry is 0what is reg2= w= after execution

MOVLW 0X0FANDWF REG2,1RLF REG2,1RLF REG2,0ADDLW 0X07

MOVLW 0X0FANDWF REG2,1RLF REG2,1RLF REG2,0ADDLW 0X07

REG2=d12 , W=d31

prepared by : Maher AL-Omari

Syntax: [ label ] RRF f,d Operands: 0 f 127

d [0,1] Operation: Status Affected: cDescription: The contents of register f are rotated one bit to the

right through the Carry flag. If d is 0, the result is placed in the W register. If d is 1, the result is placed

back in register f

Syntax: [ label ] RRF f,d Operands: 0 f 127

d [0,1] Operation: Status Affected: cDescription: The contents of register f are rotated one bit to the

right through the Carry flag. If d is 0, the result is placed in the W register. If d is 1, the result is placed

back in register f

RRF f,dRRF f,d

D7 D0C

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Example 2Example 2

00x0C0x360X06rlf reg2,0

00X060x360X06movwf reg2

0NA0x360X06andlw 0x0F

0NA0x360X36movf reg1,0

C=0reg2Reg1=0x36

W

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Syntax: [ label ] SWAPF f,d Operands: 0 f 127

d [0,1] Operation: (f) (destination),

(f) (destination) Status Affected: --Description: The upper and lower nibbles of register f are

exchanged. If d is 0, the result is placed in the W register. If dis 1, the result is placed in register f.

Syntax: [ label ] SWAPF f,d Operands: 0 f 127

d [0,1] Operation: (f) (destination),

(f) (destination) Status Affected: --Description: The upper and lower nibbles of register f are

exchanged. If d is 0, the result is placed in the W register. If dis 1, the result is placed in register f.

SWAPF f,dSWAPF f,d

0 0 1 0 1 1 0 1D7 D0

prepared by : Maher AL-Omari

Logic instructionsLogic instructionsMnemonic Operation Affects andwf f, d f and W = > d ZAndlw k k and W = > W Ziorwf f, d f or W = > d Ziorlw k k or W = > W Zxorwf f, d f xor W = > d Zxorlw k k xor W = > W Zrlf f, d rotate f left through C = > d Crrf f, d rotate f right through C = > d Ccomf f, d #f = > d Zswapf f, d fL fH = > d

Mnemonic Operation Affects andwf f, d f and W = > d ZAndlw k k and W = > W Ziorwf f, d f or W = > d Ziorlw k k or W = > W Zxorwf f, d f xor W = > d Zxorlw k k xor W = > W Zrlf f, d rotate f left through C = > d Crrf f, d rotate f right through C = > d Ccomf f, d #f = > d Zswapf f, d fL fH = > d