7.7.7 STATUS

STATUS Register

Note:

For Borrow, the polarity is reversed. A subtraction is executed by adding the two’s complement of the second operand.
For Rotate (RRCF, RLCF) instructions, this bit is loaded with either the high or low-order bit of the Source register.

Name:	STATUS
Address:	0x4D8


Bit	7	6	5	4	3	2	1	0
		TO	PD	N	OV	Z	DC	C
Access		R	R	R/W	R/W	R/W	R/W	R/W
Reset		1	1	0	0	0	0	0

Bit 6 – TO Time-Out

Reset States:

POR/BOR = 1

All Other Resets = q

Value	Description
1	Set at power-up or by execution of the `CLRWDT` or `SLEEP` instruction
0	A WDT time-out occurred

Bit 5 – PD Power-Down

Reset States:

POR/BOR = 1

All Other Resets = q

Value	Description
1	Set at power-up or by execution of the `CLRWDT` instruction
0	Cleared by execution of the `SLEEP` instruction

Bit 4 – N Negative

Used for signed arithmetic (two’s complement); indicates if the result is negative (ALU MSb = 1).

Reset States:

POR/BOR = 0

All Other Resets = u

Value	Description
1	The result is negative
0	The result is positive

Bit 3 – OV Overflow

Used for signed arithmetic (two’s complement); indicates an overflow of the 7-bit magnitude, which causes the sign bit (bit 7) to change state.

Reset States:

POR/BOR = 0

All Other Resets = u

Value	Description
1	Overflow occurred for current signed arithmetic operation
0	No overflow occurred

Bit 2 – Z Zero

Reset States:

POR/BOR = 0

All Other Resets = u

Value	Description
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

ADDWF, ADDLW, SUBLW, SUBWF instructions⁽¹⁾

Reset States:

POR/BOR = 0

All Other Resets = u

Value	Description
1	A carry-out from the 4th low-order bit of the result occurred
0	No carry-out from the 4th low-order bit of the result

Bit 0 – C Carry / Borrow

ADDWF, ADDLW, SUBLW, SUBWF instructions^(1,2)

Reset States:

POR/BOR = 0

All Other Resets = u

Value	Description
1	A carry-out from the Most Significant bit of the result occurred
0	No carry-out from the Most Significant bit of the result occurred

For Borrow, the polarity is reversed. A subtraction is executed by adding the two’s complement of the second operand. For Rotate (RRCF, RLCF) instructions, this bit is loaded with either the high or low-order bit of the Source register.