PIC16C62B-04 查看數據表（PDF） - Microchip Technology
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PIC16C62B-04 Datasheet PDF : 120 Pages
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PIC16C62B/72A
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.
Status Register
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.
POR (Power-on Reset Status bit) is cleared on a
Power-on Reset and unaffected otherwise. The user
IRP
RP1
RP0
TO
PD
Z
DC
C
PCON Register
POR
BOR
TABLE 10-3 TIME-OUT IN VARIOUS SITUATIONS
Oscillator Configuration
XT, HS, LP
RC
Power-up
PWRTE = 0
72 ms + 1024TOSC
72 ms
PWRTE = 1
1024TOSC
—
TABLE 10-4 STATUS BITS AND THEIR SIGNIFICANCE
Brown-out
72 ms + 1024TOSC
72 ms
Wake-up from
SLEEP
1024TOSC
—
POR
0
0
0
1
1
1
1
1
BOR
x
x
x
0
1
1
1
1
TO PD
1 1 Power-on Reset
0 x Illegal, TO is set on POR
x 0 Illegal, PD is set on POR
1 1 Brown-out Reset
0 1 WDT Reset
0 0 WDT Wake-up
u u MCLR Reset during normal operation
1 0 MCLR Reset during SLEEP or interrupt wake-up from SLEEP
TABLE 10-5 RESET CONDITION FOR SPECIAL REGISTERS
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
Interrupt wake-up from SLEEP
000h
PC + 1(1)
0001 1uuu
uuu1 0uuu
---- --u0
---- --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).
DS35008B-page 60
Preliminary
© 1999 Microchip Technology Inc.
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