Datasheet

PIC16C62B/72A
DS35008C-page 60 Preliminary  1998-2013 Microchip Technology Inc.
10.8 Time-out Sequence
When a POR reset occurs, the PWRT delay starts (if
enabled). When PWRT ends, the OST counts 1024
oscillator cycles (LP, XT, HS modes only). When OST
completes, the device comes out of reset. The total
time-out will vary based on oscillator configuration and
the status of the PWRT. For example, in RC mode with
the PWRT disabled, there will be no time-out at all.
If MCLR
is kept low long enough, the time-outs will
expire. Bringing MCLR
high will begin execution imme-
diately. This is useful for testing purposes or to synchro-
nize more than one PIC16CXXX device operating in
parallel.
Table 10-5 shows the reset conditions for the STATUS,
PCON and PC registers, while Table 10-6 shows the
reset conditions for all the registers.
10.9 Power Control/Status Register
(PCON)
The BOR bit is unknown on Power-on Reset. If the
Brown-out Reset circuit is used, the BOR
bit must be
set by the user and checked on subsequent resets to
see if it was cleared, indicating a Brown-out has
occurred.
P
OR (Power-on Reset Status bit) is cleared on a
Power-on Reset and unaffected otherwise. The user
Status Register
PCON Register
TABLE 10-3 TIME-OUT IN VARIOUS SITUATIONS
TABLE 10-4 STATUS BITS AND THEIR SIGNIFICANCE
TABLE 10-5 RESET CONDITION FOR SPECIAL REGISTERS
IRP RP1 RP0 TO PD Z DC C
POR BOR
Oscillator Configuration
Power-up
Brown-out
Wake-up from
SLEEP
PWRTE
= 0 PWRTE = 1
XT, HS, LP 72 ms + 1024T
OSC 1024TOSC 72 ms + 1024TOSC 1024TOSC
RC 72 ms — 72 ms —
POR BOR TO PD
0x11Power-on Reset
0x0xIllegal, TO
is set on POR
0xx0Illegal, PD is set on POR
1011Brown-out Reset
1101WDT Reset
1100WDT Wake-up
11uuMCLR
Reset during normal operation
1110MCLR
Reset during SLEEP or interrupt wake-up from SLEEP
Condition
Program
Counter
STATUS
Register
PCON
Register
Power-on Reset 000h 0001 1xxx ---- --0x
MCLR
Reset during normal operation 000h 000u uuuu ---- --uu
MCLR Reset during SLEEP 000h 0001 0uuu ---- --uu
WDT Reset 000h 0000 1uuu ---- --uu
WDT Wake-up PC + 1 uuu0 0uuu ---- --uu
Brown-out Reset 000h 0001 1uuu ---- --u0
Interrupt wake-up from SLEEP PC + 1
(1)
uuu1 0uuu ---- --uu
Legend: u = unchanged, x = unknown, - = unimplemented bit read as '0'.
Note 1: When the wake-up is due to an interrupt and the GIE bit is set, the PC is loaded with the interrupt vector (0004h).