PIC18F24 MICROCHIP [Microchip Technology], PIC18F24 Datasheet - Page 302

• Manufacturer Part Number: PIC18F24
• Description: 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

DAW
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example 1:
Example 2:
DS41159D-page 300
PIC18FXX8
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
[ label ] DAW
None
If [W<3:0> > 9] or [DC = 1] then
(W<3:0>) + 6
else
(W<3:0>)
If [W<7:4> > 9] or [C = 1] then
(W<7:4>) + 6
else
(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
0xA5
0
0
0x05
1
0
0xCE
0
0
0x34
1
0
0000
W<3:0>
W<7:4>
Process
Data
W<3:0>;
W<7:4>;
Q3
0000
Write
Q4
W
0111
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
[ label ] DECF f [,d [,a]]
0
d
a
(f) – 1
C, DC, N, OV, Z
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’ = 1, then the bank will be
selected as per the BSR value (default).
1
1
Decrement register ‘f’. If ‘d’ is ‘0’, the
DECF
Read
0000
Q2
f
[0,1]
[0,1]
0x01
0
0x00
1
 2004 Microchip Technology Inc.
255
dest
CNT,
01da
Process
Data
Q3
ffff
destination
Write to
Q4
ffff