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PIC18F23K20-E/ML Datasheet(PDF) 351 Page - Microchip Technology

Part # PIC18F23K20-E/ML
Description  28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology
PDF  456 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F23K20-E/ML Datasheet(HTML) 351 Page - Microchip Technology

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 2010 Microchip Technology Inc.
DS41303G-page 351
PIC18F2XK20/4XK20
SUBLW
Subtract W from literal
Syntax:
SUBLW k
Operands:
0
k 255
Operation:
k – (W)
W
Status Affected:
N, OV, C, DC, Z
Encoding:
0000
1000
kkkk
kkkk
Description
W is subtracted from the eight-bit
literal ‘k’. The result is placed in W.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
literal ‘k’
Process
Data
Write to W
Example 1:
SUBLW
02h
Before Instruction
W
=
01h
C=
?
After Instruction
W
=
01h
C
=
1
; result is positive
Z=
0
N=
0
Example 2:
SUBLW
02h
Before Instruction
W
=
02h
C=
?
After Instruction
W
=
00h
C
=
1
; result is zero
Z=
1
N=
0
Example 3:
SUBLW
02h
Before Instruction
W
=
03h
C=
?
After Instruction
W
=
FFh ; (2’s complement)
C
=
0
; result is negative
Z=
0
N=
1
SUBWF
Subtract W from f
Syntax:
SUBWF
f {,d {,a}}
Operands:
0
f 255
d
 [0,1]
a
 [0,1]
Operation:
(f) – (W)
dest
Status Affected:
N, OV, C, DC, Z
Encoding:
0101
11da
ffff
ffff
Description:
Subtract W from register ‘f’ (2’s
complement method). If ‘d’ is ‘0’, the
result is stored in W. If ‘d’ is ‘1’, the
result is stored back in register ‘f’
(default).
If ‘a’ is ‘0’, the Access Bank is
selected. If ‘a’ is ‘1’, the BSR is used
to select the GPR bank.
If ‘a’ is ‘0’ and the extended instruction
set is enabled, this instruction
operates in Indexed Literal Offset
Addressing mode whenever
f
95 (5Fh). See Section 24.2.3
“Byte-Oriented and Bit-Oriented
Instructions in Indexed Literal Offset
Mode” for details.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register ‘f’
Process
Data
Write to
destination
Example 1:
SUBWF
REG, 1, 0
Before Instruction
REG
=
3
W=
2
C=
?
After Instruction
REG
=
1
W=
2
C
=
1
; result is positive
Z=
0
N=
0
Example 2:
SUBWF
REG, 0, 0
Before Instruction
REG
=
2
W=
2
C=
?
After Instruction
REG
=
2
W=
0
C=
1
; result is zero
Z=
1
N=
0
Example 3:
SUBWF
REG, 1, 0
Before Instruction
REG
=
1
W=
2
C=
?
After Instruction
REG
=
FFh ;(2’s complement)
W=
2
C
=
0
; result is negative
Z=
0
N=
1



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