PIC12F508_09 datasheet(23/110 Pages) MICROCHIP

23 / 110 page

DS41236E-page 23

PIC12F508/509/16F505

STATUS REGISTER (ADDRESS: 03h) (PIC16F505)

R/W-0

R-1

R/W-x

RBWUF

—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

RBWUF: PORTB Reset bit

= Reset due to wake-up from Sleep on pin change

= After power-up or other Reset

bit 6

Reserved: Do not use

bit 5

PA0: Program Page Preselect bits

= Page 1 (200h-3FFh)

= Page 0 (000h-1FFh)

Each page is 512 bytes.

Using the PA0 bit as a general purpose read/write bit in devices which do not use it for program page

preselect is not recommended, since this may affect upward compatibility with future products.

bit 4

TO: Time-Out bit

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

= A WDT time-out occurred

bit 3

PD: Power-Down bit

= After power-up or by the CLRWDT instruction

= By execution of the SLEEP instruction

bit 2

Z: Zero bit

= The result of an arithmetic or logic operation is zero

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

bit 1

DC: Digit Carry/Borrow bit (for ADDWF and SUBWF instructions)

ADDWF:

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

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

SUBWF:

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

= 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:

= A carry occurred

= A borrow did not occur Load bit with LSb or MSb, respectively

= A carry did not occur 0 = A borrow occurred

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