PIC18F25K80 MICROCHIP [Microchip Technology], PIC18F25K80 Datasheet - Page 506

• Manufacturer Part Number: PIC18F25K80
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F66K80 FAMILY
DAW
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example 1:
Example 2:
DS39977C-page 506
Q Cycle Activity:
Before Instruction
After Instruction
Before Instruction
After Instruction
Decode
W
C
DC
W
C
DC
W
C
DC
W
C
DC
Q1
=
=
=
=
=
=
=
=
=
=
=
=
register W
Decimal Adjust W Register
DAW
None
If [W<3:0> > 9] or [DC = 1 ], then
(W<3:0>) + 6  W<3:0>;
else
(W<3:0>)  W<3:0>
If [W<7:4> > 9] or [C = 1 ], then
(W<7:4>) + 6  W<7:4>;
C = 1
else
(W<7:4>)  W<7:4>
C
DAW adjusts the eight-bit value in W,
resulting from the earlier addition of two
variables (each in packed BCD format)
and produces a correct packed BCD
result.
1
1
DAW
Read
0000
Q2
A5h
0
0
05h
1
0
CEh
0
0
34h
1
0
0000
Process
Data
Q3
0000
Write
Q4
W
0111
Preliminary
DECF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
Q Cycle Activity:
Before Instruction
After Instruction
Decode
CNT
Z
CNT
Z
Q1
=
=
=
=
register ‘f’
Decrement f
DECF f {,d {,a}}
0  f  255
d  [0,1]
a  [0,1]
(f) – 1  dest
C, DC, N, OV, Z
Decrement register ‘f’. 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.
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 29.2.3 “Byte-Oriented and
Bit-Oriented Instructions in Indexed
Literal Offset Mode”
1
1
DECF
Read
0000
Q2
01h
0
00h
1
 2011 Microchip Technology Inc.
CNT,
01da
Process
Data
Q3
1, 0
ffff
for details.
destination
Write to
Q4
ffff