Datasheet

PIC16C71X
DS30272A-page 22  1997 Microchip Technology Inc.
4.2.2.6 PCON REGISTER
The Power Control (PCON) register contains a flag bit
to allow differentiation between a Power-on Reset
(POR) to an external MCLR
Reset or WDT Reset.
Those devices with brown-out detection circuitry con-
tain an additional bit to differentiate a Brown-out Reset
(BOR) condition from a Power-on Reset condition. For
the PIC16C715 the PCON register also contains status
bits MPEEN and PER. MPEEN reflects the value of the
MPEEN bit in the configuration word. PER indicates a
parity error reset has occurred.
Applicable Devices 710 71 711 715
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
clear, 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 BODEN
bit in the Configuration word).
FIGURE 4-12: PCON REGISTER (ADDRESS 8Eh), PIC16C710/711
FIGURE 4-13: PCON REGISTER (ADDRESS 8Eh), PIC16C715
U-0 U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-q
— — — — — — POR BOR R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
- n = Value at POR reset
bit7 bit0
bit 7-2: 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)
R-U U-0 U-0 U-0 U-0 R/W-1 R/W-0 R/W-q
MPEEN — — — — PER POR BOR
(1)
R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
- n = Value at POR reset
bit7 bit0
bit 7: MPEEN: Memory Parity Error Circuitry Status bit
Reflects the value of configuration word bit, MPEEN
bit 6-3: Unimplemented: Read as '0'
bit 2: PER
: Memory Parity Error Reset Status bit
1 = No Error occurred
0 = Program Memory Fetch Parity Error occurred (must be set in software after a Parity Error Reset)
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)