Datasheet

PIC16C6X
DS30234E-page 130  1997-2013 Microchip Technology Inc.
13.4.5 TIME-OUT SEQUENCE
On power-up the time-out sequence is as follows: First
a PWRT time-out is invoked after the POR time delay
has expired. Then OST is activated. The total time-out
will vary based on oscillator configuration and the sta-
tus of the PWRT. For example, in RC mode, with the
PWRT disabled, there will be no time-out at all.
Figure 13-11, Figure 13-12, and Figure 13-13 depict
time-out sequences on power-up.
Since the time-outs occur from the POR pulse, if the
M
CLR/VPP pin is kept low long enough, the time-outs
will expire. Then bringing the M
CLR/VPP pin high will
begin execution immediately (Figure 13-14). This is
useful for testing purposes or to synchronize more than
one PIC16CXX device operating in parallel.
Table 13-10 and Table 13-11 show the reset conditions
for some special function registers, while Table 13-12
shows the reset conditions for all the registers.
13.4.6 POWER CONTROL/STATUS REGISTER
(PCON)
The Power Control/Status Register, PCON has up to
two bits, depending upon the device. Bit0 is not imple-
mented on the PIC16C62/64/65.
Bit0 is BO
R (Brown-out Reset Status bit). BOR is
unknown on Power-on Reset. It must then be set by the
user and checked on subsequent resets to see if BO
R
cleared, indicating that a brown-out has occurred. The
BO
R status bit is a “Don’t Care” and is not necessarily
predictable if the Brown-out Reset circuitry is disabled
(by clearing bit BODEN in the Configuration Word).
Bit1 is P
OR (Power-on Reset Status bit). It is cleared on
a Power-on Reset and unaffected otherwise. The user
must set this bit following a Power-on Reset.
Applicable Devices
61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67
TABLE 13-5: TIME-OUT IN VARIOUS SITUATIONS, PIC16C61/62/64/65
TABLE 13-6: TIME-OUT IN VARIOUS SITUATIONS,
PIC16C62A/R62/63/R63/64A/R64/65A/R65/66/67
TABLE 13-7: STATUS BITS AND THEIR SIGNIFICANCE, PIC16C61
TABLE 13-8: STATUS BITS AND THEIR SIGNIFICANCE, PIC16C62/64/65
Oscillator Configuration Power-up Wake-up from SLEEP
PWRTE = 1 PWRTE = 0
XT, HS, LP 72 ms + 1024T
OSC 1024TOSC 1024 TOSC
RC 72 ms — —
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 1024 TOSC
RC 72 ms — 72 ms —
T
O PD
11Power-on Reset or MCLR reset during normal operation
01WDT Reset
00WDT Wake-up
10MCLR
reset during SLEEP or interrupt wake-up from SLEEP
P
OR TO PD
011Power-on Reset
00xIllegal, TO
is set on a Power-on Reset
0x0Illegal, PD
is set on a Power-on Reset
101WDT Reset
100WDT Wake-up
1uuMCLR
reset during normal operation
110MCLR
reset during SLEEP or interrupt wake-up from SLEEP
Legend: x = unknown, u = unchanged