PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 280
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PIC18C658
Manufacturer Part Number
PIC18C658
Description
High-Performance Microcontrollers with CAN Module
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18C658.pdf
(366 pages)
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PIC18CXX8
DAW
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example1:
Example 2:
DS30475A-page 280
Before Instruction
After Instruction
Before Instruction
After Instruction
Decode
Q1
WREG
C
DC
WREG
C
DC
WREG
C
DC
WREG
C
DC
register WREG
=
=
=
=
=
=
=
=
=
=
=
=
Decimal Adjust WREG Register
[label] DAW
None
If [WREG<3:0> >9] or [DC = 1]
then
(WREG<3:0>) + 6
else
(
If [WREG<7:4> >9] or [C = 1] then
(
else
(WREG<7:4>)
C
DAW adjusts the eight bit value in
WREG resulting from the earlier
addition of two variables (each in
packed BCD format) and produces
a correct packed BCD result.
1
1
DAW
Read
WREG<3:0>)
WREG<7:4>) + 6
Q2
0000
0xA5
0
0
0x05
1
0
0xCE
0
0
0x34
1
0
0000
Process
Data
Q3
WREG<7:4>;
W<3:0>;
0000
W<3:0>;
WREG<7:4>;
Advanced Information
WREG
Write
Q4
0111
DECF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example:
Before Instruction
After Instruction
Decode
CNT
Z
CNT
Z
Q1
=
=
=
=
register ’f’
Decrement f
[ label ] DECF f [ ,d [,a] ]
0
d
a
(f) – 1
C,DC,N,OV,Z
Decrement register 'f'. If 'd' is 0, the
result is stored in WREG. 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, the Bank
will be selected as per the BSR
value.
1
1
DECF
Read
0000
Q2
0x01
0
0x00
1
f
[0,1]
[0,1]
2000 Microchip Technology Inc.
255
dest
CNT
01da
Process
Data
Q3
ffff
destination
Write to
Q4
ffff
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