PIC16F753 datasheet(15/230 Pages) MICROCHIP

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DS40001709C-page 15

PIC16F753/HV753

2.3

Global SFRs

2.3.1

STATUS REGISTER

The STATUS register, shown in Register 2-1, contains:

• the arithmetic status of the ALU

• the Reset status

• the bank select bits for data memory (RAM)

The STATUS register can be the destination for any

instruction, like 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).

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 any Status bits. For other instructions not

affecting

any

Status

bits,

see

Section 18.0

“Instruction Set Summary”.

STATUS: STATUS REGISTER

R/W-0

R-1

R/W-x

IRP

RP1

RP0

ZDC(1)

C(1)

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

IRP: Register Bank Select bit (used for indirect addressing)

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

= Bank 0, 1 (00h-FFh)

bit 6

RP1: Register Bank Select bit (used for direct addressing)

= Bank 0 (00h-7Fh)

= Bank 1 (80h-FFh)

= Bank 2 (100h-17Fh)

= Bank 3 (180h-1FFh)

bit 5

RP0: Register Bank Select bit (used for direct addressing)

= Bank 1 (80h-FFh)

= Bank 0 (00h-7Fh)

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(2) (ADDWF, ADDLW,SUBLW,SUBWF instructions), For Borrow, the polarity is reversed.

= 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

bit 0

C: Carry/Borrow bit(2) (ADDWF, ADDLW, SUBLW, SUBWF instructions)

= 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

The C and DC bits operate as a Borrow and Digit Borrow out bit, respectively, in subtraction. See the SUBLW and SUBWF

instructions for examples.

For Borrow, the polarity is reversed. A subtraction is executed by adding the two’s complement of the second operand.

For rotate (RRF, RLF) instructions, this bit is loaded with either the high-order or low-order bit of the source register.

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