PIC16F570-ISLASHSP datasheet(17/129 Pages) MICROCHIP

17 / 129 page

 2013-2014 Microchip Technology Inc.

DS40001684E-page 17

PIC16F570

4.3

STATUS Register

This register contains the arithmetic status of the ALU,

the Reset status and the page preselect bit.

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

as 000u u1uu (where u = unchanged).

Therefore, it is recommended that only BCF, BSF and

MOVWF instructions be used to alter the STATUS

bits from the STATUS register. For other instructions

which do affect Status bits, see Section 13.0

“Instruction Set Summary”.

STATUS: STATUS REGISTER

R/W-0

R-1

R/W-x

PA2

PA1

PA0

ZDC

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-5

PA<2:0>: Program Page Preselect bits

x00 = Page 0 (000h-1FFh)

x01 = Page 1 (200h-3FFh)

x10 = Page 2 (400h-5FFh)

x11 = Page 3 (600h-7FFh)

bit 4

TO: Time-out bit

1 = After power-up, CLRWDT instruction, or SLEEP instruction

0 = A WDT time-out occurred

bit 3

PD: Power-Down bit

1 = After power-up or by the CLRWDT instruction

0 = By execution of the SLEEP instruction

bit 2

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

bit 1

DC: Digit carry/borrow bit (for ADDWF and SUBWF instructions)

ADDWF:

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

0 = A carry from the 4th low-order bit of the result did not occur

SUBWF:

1 = A borrow from the 4th low-order bit of the result did not occur

0 = A borrow from the 4th low-order bit of the result occurred

bit 0

C: Carry/borrow bit (for ADDWF, SUBWF and RRF, RLF instructions)

ADDWF: SUBWF: RRF or RLF:

1 = A carry occurred 1 = A borrow did not occur; Load bit with LSb or MSb, respectively

0 = A carry did not occur 0 = A borrow occurred

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