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PIC18LF4331-E/ML Datasheet(PDF) 319 Page - Microchip Technology

Part # PIC18LF4331-E/ML
Description  28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D
PDF  392 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18LF4331-E/ML Datasheet(HTML) 319 Page - Microchip Technology

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 2010 Microchip Technology Inc.
DS39616D-page 319
PIC18F2331/2431/4331/4431
SUBLW
Subtract W from Literal
Syntax:
[ label ]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 8-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
0x02
Before Instruction
W=
1
C=
?
After Instruction
W=
1
C
=
1
; result is positive
Z=
0
N=
0
Example 2:
SUBLW
0x02
Before Instruction
W=
2
C=
?
After Instruction
W=
0
C
=
1
; result is zero
Z=
1
N=
0
Example 3:
SUBLW
0x02
Before Instruction
W=
3
C=
?
After Instruction
W
=
FF ; (2’s complement)
C=
0
; result is negative
Z=
0
N=
1
SUBWF
Subtract W from f
Syntax:
[ label ] 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’.
If = ‘a’ is ‘0’, the Access Bank will be
selected, overriding the BSR value. If
‘a’ is ‘1’, then the bank will be selected
as per the BSR value.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register ‘f’
Process
Data
Write to
destination
Example 1:
SUBWF
REG
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, W
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
Before Instruction
REG
=
0x01
W
=
0x02
C=
?
After Instruction
REG
=
0xFFh ; (2’s complement)
W
=
0x02
C
=
0x00
; result is negative
Z
=
0x00
N
=
0x01



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