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PIC18F1220E/SSSQTP bảng dữ liệu(PDF) 229 Page - Microchip Technology

tên linh kiện PIC18F1220E/SSSQTP
Giải thích chi tiết về linh kiện  18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers
PDF  308 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F1220E/SSSQTP bảng dữ liệu(HTML) 229 Page - Microchip Technology

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© 2007 Microchip Technology Inc.
DS39605F-page 227
PIC18F1220/1320
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 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
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’ (default). 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 (default).
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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