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PIC16LF1947-E/MR 参数 Datasheet PDF下载

PIC16LF1947-E/MR图片预览
型号: PIC16LF1947-E/MR
PDF下载: 下载PDF文件 查看货源
内容描述: [64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology]
分类和应用: 微控制器
文件页数/大小: 440 页 / 4740 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC16F/LF1946/47  
For example, CLRF STATUSwill clear the upper three  
bits and set the Z bit. This leaves the STATUS register  
as ‘000u u1uu’ (where u= unchanged).  
3.2.1.1  
STATUS Register  
The STATUS register, shown in Register 3-1, contains:  
• the arithmetic status of the ALU  
• the Reset status  
It is recommended, therefore, that only BCF, BSF,  
SWAPF and MOVWF instructions are used to alter the  
STATUS register, because these instructions do not  
affect any Status bits. For other instructions not  
affecting any Status bits (Refer to Section 28.0  
“Instruction Set Summary”).  
The STATUS register can be the destination for any  
instruction, like any other register. If the STATUS  
register is the destination for an instruction that affects  
the Z, DC or C bits, then the write to these three bits is  
disabled. These bits are set or cleared according to the  
device logic. Furthermore, the TO and PD bits are not  
writable. Therefore, the result of an instruction with the  
STATUS register as destination may be different than  
intended.  
Note 1: The C and DC bits operate as Borrow and  
Digit Borrow out bits, respectively, in  
subtraction.  
REGISTER 3-1:  
STATUS: STATUS REGISTER  
U-0  
U-0  
U-0  
R-1/q  
TO  
R-1/q  
PD  
R/W-0/u  
Z
R/W-0/u  
DC(1)  
R/W-0/u  
C(1)  
bit 7  
bit 0  
Legend:  
R = Readable bit  
u = Bit is unchanged  
‘1’ = Bit is set  
W = Writable bit  
x = Bit is unknown  
‘0’ = Bit is cleared  
U = Unimplemented bit, read as ‘0’  
-n/n = Value at POR and BOR/Value at all other Resets  
q = Value depends on condition  
bit 7-5  
bit 4  
Unimplemented: Read as ‘0’  
TO: Time-out bit  
1= After power-up, CLRWDTinstruction or SLEEPinstruction  
0= A WDT time-out occurred  
bit 3  
bit 2  
bit 1  
bit 0  
PD: Power-down bit  
1= After power-up or by the CLRWDTinstruction  
0= By execution of the SLEEPinstruction  
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/Digit Borrow bit (ADDWF, ADDLW,SUBLW,SUBWFinstructions)(1)  
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  
C: Carry/Borrow bit(1) (ADDWF, ADDLW, SUBLW, SUBWF instructions)(1)  
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 1: 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-order or low-order  
bit of the source register.  
2010 Microchip Technology Inc.  
Preliminary  
DS41414A-page 23  
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