PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 297

• Manufacturer Part Number: PIC18C658
• Description: High-Performance Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

SUBFWB (Cont.)
Example 1:
Example 2:
Example 3:
2000 Microchip Technology Inc.
Before Instruction
After Instruction
Before Instruction
After Instruction
Before Instruction
After Instruction
REG
WREG
C
REG
WREG
C
Z
N
REG
WREG
C
REG
WREG
C
Z
N
REG
WREG
C
REG
WREG
C
Z
N
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
SUBFWB
SUBFWB
SUBFWB
3
2
1
0xFF
2
0
0
1
2
5
1
2
3
1
0
0
1
2
0
0
2
1
1
0
; result is negative
; result is positive
; result is zero
REG
REG
REG
Advanced Information
SUBLW
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example 1:
Example 2:
Example 3:
Before Instruction
After Instruction
Before Instruction
After Instruction
Before Instruction
After Instruction
Decode
WREG
C
WREG
C
Z
N
WREG
C
WREG
C
Z
N
WREG
C
WREG
C
Z
N
Q1
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
literal ’k’
Subtract WREG from literal
[ label ] SUBLW k
0
k – (WREG)
N,OV, C, DC, Z
WREG is subtracted from the
eight bit literal 'k'. The result is
placed in WREG.
1
1
SUBLW
SUBLW
SUBLW
Read
Q2
0000
1
?
1
1
0
0
2
?
0
1
1
0
3
?
0xFF ; (2’s complement)
0
0
1
k
PIC18CXX8
; result is positive
; result is zero
; result is negative
255
0x02
0x02
0x02
1000
Process
Data
Q3
DS30475A-page 297
WREG
kkkk
Write to W
Q4
kkkk