參數(shù)資料
型號: PIC16CR620A
廠商: Microchip Technology Inc.
元件分類: 8位微控制器
英文描述: EPROM-Based 8-Bit CMOS Microcontroller
中文描述: 存儲器為基礎(chǔ)的8位CMOS微控制器
文件頁數(shù): 71/108頁
文件大小: 645K
代理商: PIC16CR620A
1998 Microchip Technology Inc.
Preliminary
DS30235G-page 71
PIC16C62X
SUBLW
Subtract W from Literal
Syntax:
Operands:
Operation:
Status
Affected:
Encoding:
Description:
[ label
0
k
255
k - (W)
→ (
W)
C, DC, Z
SUBLW k
11
110x
kkkk
kkkk
The W register is subtracted (2’s com-
plement method) from the eight bit literal
'k'. The result is placed in the W register.
1
1
Words:
Cycles:
Example 1:
SUBLW
Before Instruction
0x02
W
C
=
=
1
After Instruction
W
C
tive
=
=
1
1; result is posi-
Example 2:
Before Instruction
W
C
=
=
2
After Instruction
W
C
=
=
0
1; result is zero
Example 3:
Before Instruction
W
C
=
=
3
After Instruction
W
C
tive
=
=
0xFF
0; result is nega-
SUBWF
Subtract W from f
Syntax:
Operands:
[ label
0
f
127
d
[0,1]
(f) - (W)
→ (
dest)
C, DC, Z
SUBWF f,d
Operation:
Status
Affected:
Encoding:
Description:
00
0010
dfff
ffff
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'.
1
1
Words:
Cycles:
Example 1:
SUBWF
Before Instruction
REG1,1
REG1
W
C
=
=
=
3
2
After Instruction
REG1
W
C
=
=
=
1
2
1; result is positive
Example 2:
Before Instruction
REG1
W
C
=
=
=
2
2
After Instruction
REG1
W
C
=
=
=
0
2
1; result is zero
Example 3:
Before Instruction
REG1
W
C
=
=
=
1
2
After Instruction
REG1
W
C
=
=
=
0xFF
2
0; result is negative
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