PIC16F870_13 Datasheet, PDF (23/172 Pages) Microchip Technology – 28/40-Pin, 8-Bit CMOS FLASH Microcontrollers

PIC16F870/871
2.2.2.8 PCON Register
The Power Control (PCON) register contains flag bits
to allow differentiation between a Power-on Reset
(POR), a Brown-out Reset (BOR), a Watchdog Reset
(WDT) and an external MCLR Reset.
Note:
BOR is unknown on POR. It must be set
by the user and checked on subsequent
RESETS to see if BOR is clear, indicating
a brown-out has occurred. The BOR
status bit is a don’t care and is not
predictable if the brown-out circuit is dis-
abled (by clearing the BOREN bit in the
configuration word).
REGISTER 2-8: PCON REGISTER (ADDRESS: 8Eh)
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0 R/W-1
—
—
—
—
—
—
POR
BOR
bit 7
bit 0
bit 7-2
bit 1
bit 0
Unimplemented: Read as '0'
POR: Power-on Reset Status bit
1 = No Power-on Reset occurred
0 = A Power-on Reset occurred (must be set in software after a Power-on Reset occurs)
BOR: Brown-out Reset Status bit
1 = No Brown-out Reset occurred
0 = A Brown-out Reset occurred (must be set in software after a Brown-out Reset occurs)
Legend:
R = Readable bit
- n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
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DS30569C-page 23