PIC18F010T-I/SN View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
PIC18F010T-I/SN Datasheet PDF : 176 Pages
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SUBFWB (Cont.)
Example 1:
SUBFWB REG
Before Instruction
REG = 3
WREG = 2
C
=1
After Instruction
REG =
WREG =
C
=
Z
=
N
=
0xFF
2
0
0
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
N
=0
; result is zero
PIC18F010/020
SUBLW
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Q1
Decode
Subtract WREG from literal
[ label ] SUBLW k
0 ≤ k ≤ 255
k – (WREG) → WREG
N,OV, C, DC, Z
0000 1000 kkkk kkkk
WREG is subtracted from the
eight bit literal 'k'. The result is
placed in WREG.
1
1
Q2
Read
literal ’k’
Q3
Process
Data
Q4
Write to
WREG
Example 1:
SUBLW 0x02
Before Instruction
WREG = 1
C
=?
After Instruction
WREG = 1
C
=1
Z
=0
N
=0
; result is positive
Example 2:
SUBLW 0x02
Before Instruction
WREG = 2
C
=?
After Instruction
WREG = 0
C
=1
Z
=1
N
=0
; result is zero
Example 3:
SUBLW 0x02
Before Instruction
WREG = 3
C
=?
After Instruction
WREG =
C
=
Z
=
N
=
0xFF ; (2’s complement)
0 ; result is negative
0
1
2001 Microchip Technology Inc.
Preliminary
DS41142A-page 131
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