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PIC16C925/CL 数据表(PDF) 131 Page - Microchip Technology

部件名 PIC16C925/CL
功能描述  64/68-Pin CMOS Microcontrollers with LCD Driver
PDF  182 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

PIC16C925/CL 数据表(HTML) 131 Page - Microchip Technology

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 2001 Microchip Technology Inc.
Preliminary
DS39544A-page 129
PIC16C925/926
SUBLW
Subtract W from Literal
Syntax:
[ label ]
SUBLW k
Operands:
0
≤ k ≤ 255
Operation:
k - (W)
→ (W)
Status Affected:
C, DC, Z
Encoding:
11
110x
kkkk
kkkk
Description:
The W register is subtracted (2’s
complement method) from the eight-
bit literal 'k'. The result is placed in the
W register.
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=
?
Z=
?
After Instruction:
W=
1
C
=
1; result is positive
Z=
0
Example 2:
Before Instruction:
W=
2
C=
?
Z=
?
After Instruction:
W=
0
C
=
1; result is zero
Z=
1
Example 3:
Before Instruction:
W=
3
C=
?
Z=
?
After Instruction:
W=
0xFF
C
=
0; result is negative
Z=
0
SUBWF
Subtract W from f
Syntax:
[ label ]
SUBWF f [,d]
Operands:
0
≤ f ≤ 127
d
∈ [0,1]
Operation:
(f) - (W)
→ (destination)
Status Affected:
C, DC, Z
Encoding:
00
0010
dfff
ffff
Description:
Subtract (2’s complement method) W
register from register 'f'. If 'd' is 0, the
result is stored in the W register. If 'd' is
1, the result is stored back in register 'f'.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register ’f’
Process
data
Write to
destination
Example 1:
SUBWF
REG1,
1
Before Instruction:
REG1
=
3
W=
2
C=
?
Z=
?
After Instruction:
REG1
=
1
W=
2
C
=
1; result is positive
Z=
0
Example 2:
Before Instruction:
REG1
=
2
W=
2
C=
?
Z=
?
After Instruction:
REG1
=
0
W=
2
C
=
1; result is zero
Z=
1
Example 3:
Before Instruction:
REG1
=
1
W=
2
C=
?
Z=
?
After Instruction:
REG1
=
0xFF
W=
2
C
=
0; result is negative
Z=
0



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