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PIC18LF4331-E/ML Datasheet(PDF) 320 Page - Microchip Technology

Part # PIC18LF4331-E/ML
Description  28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D
PDF  392 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18LF4331-E/ML Datasheet(HTML) 320 Page - Microchip Technology

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PIC18F2331/2431/4331/4431
DS39616D-page 320
 2010 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’. 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.
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’. If ‘a’ is ‘0’, the
Access Bank will be selected, overrid-
ing the BSR value. If ‘a’ is ‘1’, then the
bank will be selected as per the BSR
value.
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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