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DM163006 Datasheet(PDF) 251 Page - Microchip Technology

Part # DM163006
Description  High-Performance ROM-less Microcontrollers
PDF  320 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

DM163006 Datasheet(HTML) 251 Page - Microchip Technology

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 2001 Microchip Technology Inc.
Advance Information
DS39541A-page 251
PIC18C601/801
SUBFWB (Cont.)
Example 1:
SUBFWB
REG
Before Instruction
REG
=
3
WREG
=
2
C=
1
After Instruction
REG
=
0FFh
WREG
=
2
C=
0
Z=
0
N
=
1
; result is negative
Example 2:
SUBFWB
REG
Before Instruction
REG
=
2
WREG
=
5
C=
1
After Instruction
REG
=
2
WREG
=
3
C=
1
Z=
0
N
=
0
; result is positive
Example 3:
SUBFWB
REG
Before Instruction
REG
=
1
WREG
=
2
C=
0
After Instruction
REG
=
0
WREG
=
2
C=
1
Z
=
1
; result is zero
N=
0
SUBLW
Subtract WREG from literal
Syntax:
[ label ]SUBLW k
Operands:
0
≤ k ≤ 255
Operation:
k – (WREG)
→ WREG
Status Affected:
N,OV, C, DC, Z
Encoding:
0000
1000
kkkk
kkkk
Description:
WREG is subtracted from the eight
bit literal 'k'. The result is placed in
WREG.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
literal ’k’
Process
Data
Write to
WREG
Example 1:
SUBLW
02h
Before Instruction
WREG
=
1
C=
?
After Instruction
WREG
=
1
C
=
1
; result is positive
Z=
0
N=
0
Example 2:
SUBLW
02h
Before Instruction
WREG
=
2
C=
?
After Instruction
WREG
=
0
C
=
1
; result is zero
Z=
1
N=
0
Example 3:
SUBLW
02h
Before Instruction
WREG
=
3
C=
?
After Instruction
WREG
=
0FFh ; (2’s complement)
C
=
0
; result is negative
Z=
0
N=
1



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