Datasheet

 1998-2013 Microchip Technology Inc. DS40182D-page 75
PIC16CE62X
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 com-
plement 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 register '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