PIC16F871 Datasheet

IC型号：
PIC16F871
PDF描述：
28/40-Pin, 8-Bit CMOS FLASH Microcontrollers
文件大小：
1755.40KB
PDF页数：
172页
芯片厂家：
Microchip

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PIC16F870/871

2.2.2.1

STATUS REGISTER

The STATUS Register contains the arithmetic status of

the ALU, the RESET status and the bank select bits for

data memory.

The STATUS Register can be the destination for any

instruction, as with any other register. If the STATUS

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.

For example,

CLRF STATUS

will clear the upper-three

bits and set the Z bit. This leaves the STATUS register

000u u1uu

(where

= unchanged).

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 the Z, C or DC bits from the STATUS Register.

For other instructions not affecting any status bits, see

the "Instruction Set Summary."

Note 1:

The C and DC bits operate as a borrow

and digit borrow bit, respectively, in sub-

traction. See the

SUBLW

and

SUBWF

instructions for examples.

R/W-0

IRP

bit7

R/W-0

RP1

R/W-0

RP0

R-1

R/W-x

bit0

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as 鈥?鈥?/div>

- n= Value at POR reset

bit 7:

IRP:

= Bank 2, 3 (100h - 1FFh)

= Bank 0, 1 (00h - FFh)

bit 6-5:

RP1:RP0:

= Bank 3 (180h - 1FFh)

= Bank 2 (100h - 17Fh)

= Bank 1 (80h - FFh)

= Bank 0 (00h - 7Fh)

Each bank is 128 bytes

bit 4:

TO:

Time-out bit

= After power-up,

CLRWDT

instruction, or

SLEEP

instruction

= A WDT time-out occurred

PD:

Power-down bit

= After power-up or by the

CLRWDT

instruction

= By execution of the

SLEEP

instruction

Zero bit

= The result of an arithmetic or logic operation is zero

= The result of an arithmetic or logic operation is not zero

DC:

Digit carry/borrow bit (ADDWF,

ADDLW,SUBLW,SUBWF

instructions)

(for borrow the polarity is reversed)

= A carry-out from the 4th low order bit of the result occurred

= No carry-out from the 4th low order bit of the result

Carry/borrow bit (ADDWF,

ADDLW,SUBLW,SUBWF

instructions)

= A carry-out from the most significant bit of the result occurred

= 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鈥檚 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.

bit 3:

bit 2:

bit 1:

bit 0:

DS30569A-page 16

Preliminary

漏

1999 Microchip Technology Inc.

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