PIC16LC773-04SLASHSP datasheet(133/200 Pages) MICROCHIP

133 / 200 page

PIC16C77X

Advance Information

DS30275A-page 133

12.8

Time-out Sequence

On power-up the time-out sequence is as follows: First

PWRT time-out is invoked by the POR pulse. When the

PWRT delay expires the Oscillator Start-up Timer is

activated. The total time-out will vary based on oscilla-

tor configuration and the status of the PWRT. For exam-

ple, in RC mode with the PWRT disabled, there will be

no time-out at all. Figure 12-7, Figure 12-8, Figure 12-

9 and Figure 12-10 depict time-out sequences on

power-up.

Since the time-outs occur from the POR pulse, if MCLR

is kept low long enough, the time-outs will expire. Then

bringing MCLR high will begin execution immediately

(Figure 12-9). This is useful for testing purposes or to

synchronize more than one PICmicro microcontroller

operating in parallel.

Table 12-5 shows the reset conditions for some special

function registers, while Table 12-6 shows the reset

conditions for all the registers.

12.9

Power Control/Status Register

(PCON)

The Power Control/Status Register, PCON has two sta-

tus bits that provide indication of which power-up type

reset occurred.

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

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 BOR occurred. However, if the

brown-out circuitry is disabled, the BOR bit is a "Don’t

Care" bit and is considered unknown upon a POR.

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 + 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

PCON

Power-on Reset

000h

0001 1xxx

---- --01

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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