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PIC18F4685-I/SP Datasheet(PDF) 402 Page - Microchip Technology

Part # PIC18F4685-I/SP
Description  28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
PDF  484 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F4685-I/SP Datasheet(HTML) 402 Page - Microchip Technology

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PIC18F2682/2685/4682/4685
DS39761B-page 400
Preliminary
© 2007 Microchip Technology Inc.
SUBWFB
Subtract W from f with Borrow
Syntax:
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 is selected.
If ‘a’ is ‘1’, the BSR is used to select the
GPR bank (default).
If ‘a’ is ‘0’ and the extended instruction
set is enabled, this instruction operates
in Indexed Literal Offset Addressing
mode whenever f
≤ 95 (5Fh). See
Section 25.2.3 “Byte-Oriented and
Bit-Oriented Instructions in Indexed
Literal Offset Mode” for details.
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
=
19h
(0001 1001)
W
=0Dh
(0000 1101)
C=
1
After Instruction
REG
=
0Ch
(0000 1011)
W
=0Dh
(0000 1101)
C=
1
Z=
0
N
=
0
; result is positive
Example 2:
SUBWFB
REG, 0, 0
Before Instruction
REG
=
1Bh
(0001 1011)
W
=1Ah
(0001 1010)
C=
0
After Instruction
REG
=
1Bh
(0001 1011)
W
=
00h
C=
1
Z
=
1
; result is zero
N=
0
Example 3:
SUBWFB
REG, 1, 0
Before Instruction
REG
=
03h
(0000 0011)
W
=0Eh
(0000 1101)
C=
1
After Instruction
REG
=
F5h
(1111 0100)
; [2’s comp]
W
=0Eh
(0000 1101)
C=
0
Z=
0
N
=
1
; result is negative
SWAPF
Swap f
Syntax:
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 is selected.
If ‘a’ is ‘1’, the BSR is used to select the
GPR bank (default).
If ‘a’ is ‘0’ and the extended instruction
set is enabled, this instruction operates
in Indexed Literal Offset Addressing
mode whenever f
≤ 95 (5Fh). See
Section 25.2.3 “Byte-Oriented and
Bit-Oriented Instructions in Indexed
Literal Offset Mode” for details.
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
=
53h
After Instruction
REG
=
35h



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