PIC16F54-ESLASHP datasheet(19/88 Pages) MICROCHIP

19 / 88 page

DS41213D-page 17

PIC16F5X

3.3

STATUS Register

This register contains the arithmetic status of the ALU,

the Reset status and the page preselect bits for

program memories larger than 512 words.

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,

MOVWF

and SWAPF instructions be used to alter the

STATUS register because these instructions do not

affect the Z, DC or C bits from the STATUS register. For

other instructions which do affect Status bits, see

Section 9.0 “Instruction Set Summary”.

STATUS REGISTER (ADDRESS: 03h)

R/W-0

R-1

R/W-x

PA2

PA1

PA0

ZDC

bit 7

bit 0

bit 7

PA2: Reserved, do not use

Use of the PA2 bit as a general purpose read/write bit is not recommended, since this may affect upward

compatibility with future products.

bit 6-5

PA<1:0>: Program Page Preselect bits (PIC16F57/PIC16F59)

= Page 0 (000h-1FFh)

= Page 1 (200h-3FFh)

= Page 2 (400h-5FFh)

= Page 3 (600h-7FFh)

Each page is 512 words. Using the PA<1:0> bits as general purpose read/write bits in devices which do

not use them for program page preselect is not recommended. 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 to 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 to 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

Loaded with LSb or MSb, respectively

= A carry did not occur

= 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

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