Datasheet

 2000 Microchip Technology Inc. Preliminary DS40197B-page 13
PIC16HV540
4.3 STATUS Register
This register contains the arithmetic status of the ALU,
the RESET status, and the page preselect bits for pro-
gram memories larger than 512 words.
The STATUS register can be the destination for any
instruction, as with any other register. If the STATUS
register is the destination for an instruction that affects
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 while the PCWUF
bit is a read/write bit. There-
fore, the result of an instruction with the STATUS regis-
ter 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 and
MOVWF instructions be used to alter the STATUS regis-
ter because these instructions do not affect the Z, DC
or C bits from the STATUS register. For other instruc-
tions, which do affect STATUS bits, see Section 8.0,
Instruction Set Summary.
REGISTER 4-1: STATUS REGISTER (ADDRESS:03h)
R/W-0 R/W-0 R/W-0 R-1 R-1 R/W-x R/W-x R/W-x
PCWUF
PA 1 PA 0 TO PD Z DC C R = Readable bit
W = Writable bit
- n = Value at POR reset
bit7 bit0
bit 7: PCWUF
: Pin Change Reset bit
1 = After Power-up Reset (POR) or SLEEP command
0 = After a wake-up on pin change event
bit 6-5: Not Applicable
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