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PIC18F4520E/MLQTP 데이터시트(PDF) 288 Page - Microchip Technology

부품명 PIC18F4520E/MLQTP
상세설명  28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
PDF  390 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F4520E/MLQTP 데이터시트(HTML) 288 Page - Microchip Technology

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PIC18F2420/2520/4420/4520
DS39631A-page 286
Preliminary
 2004 Microchip Technology Inc.
DAW
Decimal Adjust W Register
Syntax:
DAW
Operands:
None
Operation:
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> + DC > 9] or [C = 1] then
(W<7:4>) + 6 + DC → W<7:4> ;
else
(W<7:4>) + DC
→ W<7:4>
Status Affected:
C
Encoding:
0000
0000
0000
0111
Description:
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.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register W
Process
Data
Write
W
Example1:
DAW
Before Instruction
W=
A5h
C=
0
DC
=
0
After Instruction
W
=
05h
C=
1
DC
=
0
Example 2:
Before Instruction
W=
CEh
C=
0
DC
=
0
After Instruction
W
=
34h
C=
1
DC
=
0
DECF
Decrement f
Syntax:
DECF f {,d {,a}}
Operands:
0
≤ f ≤ 255
d
∈ [0,1]
a
∈ [0,1]
Operation:
(f) – 1
→ dest
Status Affected:
C, DC, N, OV, Z
Encoding:
0000
01da
ffff
ffff
Description:
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 (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 24.2.3 “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:
DECF
CNT,
1, 0
Before Instruction
CNT
=
01h
Z=
0
After Instruction
CNT
=
00h
Z=
1



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