
PIC16C717/770/771
DS41120B-page 140
2002 Microchip Technology Inc.
SUBLW
Subtract W from Literal
Syntax:
[ label ]
SUBLW k
Operands:
0
≤ k ≤ 255
Operation:
k - (W)
→ (W)
Status Affected: C, DC, Z
Description:
The W register is subtracted (2’s
complement method) from the
eight bit literal 'k'. The result is
placed in the W register.
SUBWF
Subtract W from f
Syntax:
[ label ]
SUBWF f,d
Operands:
0
≤ f ≤ 127
d
∈ [0,1]
Operation:
(f) - (W)
→ (destination)
Status Affected: C, DC, Z
Description:
Subtract (2’s complement method)
W register from register 'f'. If 'd' is 0,
the result is stored in the W regis-
ter. If 'd' is 1, the result is stored
back in register 'f'.
SWAPF
Swap Nybbles in f
Syntax:
[ label ] SWAPF f,d
Operands:
0
≤ f ≤ 127
d
∈ [0,1]
Operation:
(f<3:0>)
→ (destination<7:4>),
(f<7:4>)
→ (destination<3:0>)
Status Affected:
None
Description:
The upper and lower nybbles of
register 'f' are exchanged. If 'd' is
0, the result is placed in W regis-
ter. If 'd' is 1, the result is placed in
register 'f'.
XORLW
Exclusive OR Literal with W
Syntax:
[label]
XORLW k
Operands:
0
≤ k ≤ 255
Operation:
(W) .XOR. k
→ (W)
Status Affected:
Z
Description:
The contents of the W register
are XOR’ed with the eight bit lit-
eral 'k'. The result is placed in
the W register.
XORWF
Exclusive OR W with f
Syntax:
[label]
XORWF
f,d
Operands:
0
≤ f ≤ 127
d
∈ [0,1]
Operation:
(W) .XOR. (f)
→ (destination)
Status Affected:
Z
Description:
Exclusive 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'.