PIC16F627A Datasheet, PDF (29/168 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontrollers

PIC16F627A/628A/648A
4.2.2.6 PCON Register
The PCON register contains flag bits to differentiate
between a Power-on Reset, an external MCLR Reset,
WDT Reset or a Brown-out Reset.
Note:
BOR is unknown on Power-on Reset. It
must then be set by the user and checked
on subsequent RESETS to see if BOR is
cleared, indicating a brown-out has
occurred. The BOR STATUS bit is a “don't
care” and is not necessarily predictable if
the brown-out circuit is disabled (by
clearing the BOREN bit in the
Configuration word).
REGISTER 4-6:
PCON REGISTER (ADDRESS: 8Eh)
U-0
U-0
U-0
U-0
—
—
—
—
bit 7
R/W-1
OSCF
U-0
R/W-0 R/W-x
—
POR
BOR
bit 0
bit 7-4
bit 3
bit 2
bit 1
bit 0
Unimplemented: Read as '0'
OSCF: INTOSC oscillator frequency
1 = 4 MHz typical
0 = 37 kHz typical
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
 2002 Microchip Technology Inc.
Preliminary
DS40044A-page 27