PIC16C62B-20/SS【PDF 78/120 页】IC MCU OTP 2KX14 PWM 28SSOP

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PIC16C62B/72A

DS35008B-page 60

Preliminary

1999 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.

POR (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

POR

BOR

Oscillator Configuration

Power-up

Brown-out

Wake-up from

SLEEP

PWRTE = 0

PWRTE = 1

XT, HS, LP

72 ms + 1024TOSC

1024TOSC

72 ms + 1024TOSC

1024TOSC

72 ms

—72 ms

—

POR

BOR

Power-on Reset

Illegal, TO is set on POR

Illegal, PD is set on POR

Brown-out Reset

WDT Reset

WDT Wake-up

MCLR Reset during normal operation

MCLR 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).

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