Datasheet

PIC12C67X
DS30561C-page 80  1997-2013 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
Encoding: 11 110x kkkk kkkk
Description: The W register is subtracted (2’s
complement method) from the eight
bit literal 'k'. The result is placed in
the W register.
Words: 1
Cycles: 1
Example 1: SUBLW 0x02
Before Instruction
W= 1
C= ?
After Instruction
W= 1
C = 1; result is positive
Example 2: Before Instruction
W= 2
C= ?
After Instruction
W= 0
C = 1; result is zero
Example 3: Before Instruction
W= 3
C= ?
After Instruction
W= 0xFF
C = 0; result is nega-
tive
SUBWF Subtract W from f
Syntax: [ label ]
SUBWF f,d
Operands: 0 f 127
d  [0,1]
Operation: (f) - (W) dest)
Status
Affected:
C, DC, Z
Encoding: 00 0010 dfff ffff
Description: Subtract (2’s complement method) W
register from register 'f'. If 'd' is 0, the
result is stored in the W register. If 'd'
is 1, the result is stored back in regis-
ter 'f'.
Words: 1
Cycles: 1
Example 1: SUBWF REG1,1
Before Instruction
REG1 = 3
W=2
C=?
After Instruction
REG1 = 1
W=2
C = 1; result is positive
Example 2: Before Instruction
REG1 = 2
W=2
C=?
After Instruction
REG1 = 0
W=2
C = 1; result is zero
Example 3: Before Instruction
REG1 = 1
W=2
C=?
After Instruction
REG1 = 0xFF
W=2
C = 0; result is negative