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PIC18F258-E/LSQTP bảng dữ liệu(PDF) 320 Page - Microchip Technology

tên linh kiện PIC18F258-E/LSQTP
Giải thích chi tiết về linh kiện  28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module
PDF  402 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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PIC18F258-E/LSQTP bảng dữ liệu(HTML) 320 Page - Microchip Technology

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PIC18FXX8
DS41159E-page 318
© 2006 Microchip Technology Inc.
SUBWFB
Subtract W from f with Borrow
Syntax:
[
label ]
SUBWFB
f [,d [,a]]
Operands:
0
≤ f ≤ 255
d
∈ [0,1]
a
∈ [0,1]
Operation:
(f) – (W) – (C)
→ dest
Status Affected:
N, OV, C, DC, Z
Encoding:
0101
10da
ffff
ffff
Description:
Subtract W and the Carry flag (borrow)
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:
SUBWFB REG, 1, 0
Before Instruction
REG
=
0x19
(0001 1001)
W
=
0x0D
(0000 1101)
C
=
0x01
After Instruction
REG
=
0x0C
(0000 1011)
W
=
0x0D
(0000 1101)
C
=
0x01
Z
=
0x00
N
=
0x00
; result is positive
Example 2:
SUBWFB
REG, 0, 0
Before Instruction
REG
=
0x1B
(0001 1011)
W
=
0x1A
(0001 1010)
C
=
0x00
After Instruction
REG
=
0x1B
(0001 1011)
W
=
0x00
C
=
0x01
Z
=
0x01
; result is zero
N
=
0x00
Example 3:
SUBWFB REG, 1, 0
Before Instruction
REG
=
0x03
(0000 0011)
W
=
0x0E
(0000 1101)
C
=
0x01
After Instruction
REG
=
0xF5
(1111 0100)
; [2’s comp]
W
=
0x0E
(0000 1101)
C
=
0x00
Z
=
0x00
N
=
0x01
; result is negative
SWAPF
Swap f
Syntax:
[
label ]
SWAPF f [,d [,a]]
Operands:
0
≤ f ≤ 255
d
∈ [0,1]
a
∈ [0,1]
Operation:
(f<3:0>)
→ dest<7:4>,
(f<7:4>)
→ dest<3:0>
Status Affected:
None
Encoding:
0011
10da
ffff
ffff
Description:
The upper and lower nibbles of register
‘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 ‘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:
SWAPF
REG
Before Instruction
REG
=
0x53
After Instruction
REG
=
0x35



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