[ label ] SUBWFB f [,d [," />
鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� PIC18F4539T-E/ML
寤�(ch菐ng)鍟嗭細 Microchip Technology
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RAM 瀹归噺锛� 1408 x 8
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鍖呰锛� 甯跺嵎 (TR)
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PIC18FXX39
DS30485A-page 248
Preliminary
2002 Microchip Technology Inc.
SUBWFB
Subtract W from f with Borrow
Syntax:
[ label ] SUBWFB f [,d [,a]
Operands:
0
鈮� f 鈮� 255
d
鈭� [0,1]
a
鈭� [0,1]
Operation:
(f) 鈥� (W) 鈥� (C)
鈫� dest
Status Affected:
N, OV, C, DC, Z
Encoding:
0101
10da
ffff
Description:
Subtract W and the carry flag (bor-
row) from register 'f' (2鈥檚 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 鈥榓(ch菐n)鈥� is 0,
the Access Bank will be selected,
overriding the BSR value. If 鈥榓(ch菐n)鈥� 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:
SUBWFB
REG, 1, 0
Before Instruction
REG
=
0x19
(0001 1001)
W
=
0x0D
(0000 1101)
C=
1
After Instruction
REG
=
0x0C
(0000 1011)
W
=
0x0D
(0000 1101)
C=
1
Z=
0
N
=
0
; result is positive
Example 2:
SUBWFB
REG, 0, 0
Before Instruction
REG
=
0x1B
(0001 1011)
W
=
0x1A
(0001 1010)
C=
0
After Instruction
REG
=
0x1B
(0001 1011)
W
=
0x00
C=
1
Z
=
1
; result is zero
N=
0
Example 3:
SUBWFB
REG, 1, 0
Before Instruction
REG
=
0x03
(0000 0011)
W
=
0x0E
(0000 1101)
C=
1
After Instruction
REG
=
0xF5
(1111 0100)
; [2鈥檚 comp]
W
=
0x0E
(0000 1101)
C=
0
Z=
0
N
=
1
; result is negative
SWAPF
Swap f
Syntax:
[ label ] SWAPF f [,d [,a]
Operands:
0
鈮� f 鈮� 255
d
鈭� [0,1]
a
鈭� [0,1]
Operation:
(f<3:0>)
鈫� dest<7:4>,
(f<7:4>)
鈫� dest<3:0>
Status Affected:
None
Encoding:
0011
10da
ffff
Description:
The upper and lower nibbles of reg-
ister 'f' are exchanged. If 'd' is 0, the
result is placed in W. If 'd' is 1, the
result is placed in register 'f'
(default). If 鈥榓(ch菐n)鈥� is 0, the Access
Bank will be selected, overriding
the BSR value. If 鈥榓(ch菐n)鈥� 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:
SWAPF
REG, 1, 0
Before Instruction
REG
=
0x53
After Instruction
REG
=
0x35
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娣诲姞鏇村閲囪臣(g貌u)

鎴戠殑鑱�(li谩n)绯绘柟寮�

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