PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 298
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PIC18C658
Manufacturer Part Number
PIC18C658
Description
High-Performance Microcontrollers with CAN Module
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18C658.pdf
(366 pages)
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PIC18CXX8
SUBWF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
DS30475A-page 298
Decode
Q1
register ’f’
Subtract WREG from f
[ label ] SUBWF f [ ,d [,a] ]
0
d
a
(f) – (WREG)
N,OV, C, DC, Z
Subtract WREG from register 'f'
(2’s complement method). If 'd' is
0, the result is stored in WREG. If
'd' is 1, the result is stored back in
register 'f' (default). If ’a’ is 0, the
Access Bank will be selected,
overriding the BSR value. If ’a’ is
1, the Bank will be selected as per
the BSR value.
1
1
Read
Q2
0101
f
[0,1]
[0,1]
255
11da
Process
Data
Q3
dest
ffff
Advanced Information
destination
Write to
Q4
ffff
SUBWF
Example 1:
Example 2:
Example 3:
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
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
Subtract WREG from f (cont’d)
SUBWF
SUBWF
SUBWF
3
2
?
1
2
1
0
0
2
2
?
2
0
1
1
0
1
2
?
0xFF ;(2’s complement)
2
0
0
1
2000 Microchip Technology Inc.
; result is positive
; result is zero
; result is negative
REG
REG, W
REG
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