2009 Microchip Technology Inc.
DS40044G-page 29
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.
REGISTER 4-6:
PCON – POWER CONTROL REGISTER (ADDRESS: 8Eh)
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).
U-0
R/W-1
U-0
R/W-0
R/W-x
—
OSCF
—POR
BOR
bit 7
bit 0
bit 7-4
Unimplemented:
Read as ‘0’
bit 3
OSCF
: INTOSC Oscillator Frequency bit
1
= 4 MHz typical
0
= 48 kHz typical
bit 2
Unimplemented
: Read as ‘0’
bit 1
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)
bit 0
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
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
