Datasheet

PIC12F508/509/16F505

R/W-0 R/W-0 R/W-0 R-1 R-1 R/W-x R/W-x R/W-x

RBWUF

—PA0TO PD ZDCC

bit 7 bit 0

bit 7 RBWUF: PORTB Reset bit

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

0 = After power-up or other Reset

bit 6 Reserved: Do not use

bit 5 PA0: Program Page Preselect bits

1 = Page 1 (200h-3FFh)

0 = 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

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

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