PIC16F74-ESLASHML datasheet(97/174 Pages) MICROCHIP

97 / 174 page

 2002 Microchip Technology Inc.

DS30325B-page 95

PIC16F7X

12.10 Power Control/Status Register

(PCON)

The Power Control/Status Register, PCON, has two

bits to indicate the type of RESET that last occurred.

Bit0 is Brown-out Reset Status bit, BOR. Bit BOR is

unknown on a Power-on Reset. It must then be set by

the user and checked on subsequent RESETS to see

if bit BOR cleared, indicating a Brown-out Reset

occurred. When the Brown-out Reset is disabled, the

state of the BOR bit is unpredictable.

Bit1 is POR (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.

TABLE 12-3:

TIME-OUT IN VARIOUS SITUATIONS

TABLE 12-4:

STATUS BITS AND THEIR SIGNIFICANCE

TABLE 12-5:

RESET CONDITION FOR SPECIAL REGISTERS

Oscillator Configuration

Power-up

Brown-out

Wake-up from

SLEEP

PWRTE = 0

PWRTE = 1

XT, HS, LP

72 ms + 1024 TOSC

1024 TOSC

72 ms + 1024 TOSC

1024 TOSC

72 ms

—

72 ms

—

POR

(PCON<1>)

BOR

(PCON<0>)

(STATUS<4>)

(STATUS<3>)

Significance

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

PCON

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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