PIC16F819 Datasheet

IC型号：
PIC16F819
PDF描述：
18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Tech...
文件大小：
68.31KB
PDF页数：
176页
芯片厂家：
MICROCHIP

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PIC16F818/819

2.2.2.1

Status Register

The Status register, shown in Register 2-1, 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 reg-

ister is the destination for an instruction that affects the

Z, DC or C bits, then the write to these three bits is dis-

abled. 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 as

鈥?00u

u1uu鈥?/div>

(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

Section 13.0 鈥淚nstruction Set Summary鈥?

Note:

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.

STATUS REGISTER (ADDRESS 03h, 83h, 103h, 183h)

R/W-0

IRP

bit 7

R/W-0

RP1

R/W-0

RP0

R-1

R/W-x

bit 0

bit 7

IRP:

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

= Bank 0, 1 (00h-FFh)

RP<1:0>:

= Bank 3 (180h-1FFh)

= Bank 2 (100h-17Fh)

= Bank 1 (80h-FFh)

= Bank 0 (00h-7Fh)

Each bank is 128 bytes.

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

and

SUBWF

instructions)

(1)

= 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

and

SUBWF

instructions)

(1,2)

= 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 1:

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.

Legend:

R = Readable bit

- n = Value at POR

W = Writable bit

鈥?鈥?= Bit is set

U = Unimplemented bit, read as 鈥?鈥?/div>

鈥?鈥?= Bit is cleared

x = Bit is unknown

bit 6-5

bit 4

bit 3

bit 2

bit 1

bit 0

DS39598D-page 16

Preliminary

铮?/div>

2003 Microchip Technology Inc.

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