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PIC18F2320-I/SP 参数 Datasheet PDF下载

PIC18F2320-I/SP图片预览
型号: PIC18F2320-I/SP
PDF下载: 下载PDF文件 查看货源
内容描述: 28 /40/ 44引脚高性能,增强型闪存微控制器与10位A / D和纳瓦技术 [28/40/44-Pin High-Performance, Enhanced Flash Microcontrollers with 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光电二极管PC时钟
文件页数/大小: 388 页 / 6899 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC18F2220/2320/4220/4320  
For example, CLRF STATUSwill clear the upper three  
bits and set the Z bit. This leaves the Status register  
5.13 Status Register  
The Status register, shown in Register 5-2, contains the  
arithmetic status of the ALU. The Status register can be  
the operand for any instruction as with any other regis-  
ter. If the Status register is the destination for an instruc-  
tion that affects the Z, DC, C, OV or N bits, then the  
write to these five bits is disabled. These bits are set or  
cleared according to the device logic. Therefore, the  
result of an instruction with the Status register as  
destination may be different than intended.  
as 000u u1uu(where u= unchanged).  
It is recommended, therefore, that only BCF, BSF,  
SWAPF, MOVFF and MOVWF instructions are used to  
alter the Status register, because these instructions do  
not affect the Z, C, DC, OV or N bits in the Status reg-  
ister. For other instructions not affecting any status bits,  
see Table 24-2.  
Note:  
The C and DC bits operate as a borrow  
and digit borrow bit respectively, in  
subtraction.  
REGISTER 5-2:  
STATUS REGISTER  
U-0  
U-0  
U-0  
R/W-x  
R/W-x  
OV  
R/W-x  
Z
R/W-x  
DC  
R/W-x  
C
N
bit 7  
bit 0  
bit 7-5  
bit 4  
Unimplemented: Read as ‘0’  
N: Negative bit  
This bit is used for signed arithmetic (2’s complement). It indicates whether the result was  
negative (ALU MSB = 1).  
1= Result was negative  
0= Result was positive  
bit 3  
OV: Overflow bit  
This bit is used for signed arithmetic (2’s complement). It indicates an overflow of the 7-bit  
magnitude which causes the sign bit (bit 7) to change state.  
1= Overflow occurred for signed arithmetic (in this arithmetic operation)  
0= No overflow occurred  
bit 2  
bit 1  
Z: Zero bit  
1= The result of an arithmetic or logic operation is zero  
0= The result of an arithmetic or logic operation is not zero  
DC: Digit carry/borrow bit  
For ADDWF, ADDLW, SUBLWand SUBWFinstructions.  
1= A carry-out from the 4th low order bit of the result occurred  
0= No carry-out from the 4th low order bit of the result  
Note:  
For borrow, the polarity is reversed. A subtraction is executed by adding the two’s  
complement of the second operand. For rotate (RRF, RLF) instructions, this bit is  
loaded with either the bit 4 or bit 3 of the source register.  
bit 0  
C: Carry/borrow bit  
For ADDWF, ADDLW, SUBLWand SUBWFinstructions.  
1= A carry-out from the Most Significant bit of the result occurred  
0= No carry-out from the Most Significant bit of the result occurred  
Note:  
For borrow, the polarity is reversed. A subtraction is executed by adding the two’s  
complement of the second operand. For rotate (RRF, RLF) instructions, this bit is  
loaded with either the high or low order bit of the source register.  
Legend:  
R = Readable bit  
W = Writable bit  
‘1’ = Bit is set  
U = Unimplemented bit, read as ‘0’  
‘0’ = Bit is cleared x = Bit is unknown  
- n = Value at POR  
DS39599C-page 68  
2003 Microchip Technology Inc.  
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