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PIC18F4580-I/PT 参数 Datasheet PDF下载

PIC18F4580-I/PT图片预览
型号: PIC18F4580-I/PT
PDF下载: 下载PDF文件 查看货源
内容描述: 28 /40/ 44引脚增强型闪存微控制器与ECAN技术, 10位A / D和纳瓦技术 [28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology]
分类和应用: 闪存微控制器和处理器外围集成电路时钟
文件页数/大小: 490 页 / 8912 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC18F2480/2580/4480/4580  
DAW  
Decimal Adjust W Register  
DECF  
Decrement f  
Syntax:  
DAW  
None  
Syntax:  
DECF f {,d {,a}}  
Operands:  
Operation:  
Operands:  
0 f 255  
d [0,1]  
a [0,1]  
If [W<3:0> >9] or [DC = 1] then,  
(W<3:0>) + 6 W<3:0>;  
else,  
Operation:  
(f) – 1 dest  
(W<3:0>) W<3:0>;  
Status Affected:  
Encoding:  
C, DC, N, OV, Z  
0000  
01da  
ffff  
ffff  
If [W<7:4> >9] or [C = 1] then,  
(W<7:4>) + 6 W<7:4>;  
C = 1,  
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’.  
else,  
(W<7:4>) W<7:4>  
If ‘a’ is ‘0’, the Access Bank is selected.  
If ‘a’ is ‘1’, the BSR is used to select the  
GPR bank.  
Status Affected:  
Encoding:  
C
0000  
0000  
0000  
0111  
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 26.2.3 “Byte-Oriented and  
Bit-Oriented Instructions in Indexed  
Literal Offset Mode” for details.  
Description:  
DAWadjusts 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:  
Cycles:  
1
1
Words:  
Cycles:  
1
1
Q Cycle Activity:  
Q1  
Q2  
Q3  
Q4  
Q Cycle Activity:  
Q1  
Decode  
Read  
register W  
Process  
Data  
Write  
W
Q2  
Q3  
Q4  
Decode  
Read  
register ‘f’  
Process  
Data  
Write to  
destination  
Example 1:  
DAW  
Before Instruction  
Example:  
DECF  
CNT,  
1, 0  
W
=
=
=
A5h  
0
Before Instruction  
C
CNT  
Z
=
=
01h  
0
DC  
0
After Instruction  
After Instruction  
W
=
=
=
05h  
1
0
CNT  
Z
=
=
00h  
1
C
DC  
Example 2:  
Before Instruction  
W
=
=
=
CEh  
0
0
C
DC  
After Instruction  
W
=
=
=
34h  
1
0
C
DC  
DS39637D-page 386  
© 2009 Microchip Technology Inc.  
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