PIC16F716 datasheet(70/136 Pages) MICROCHIP

70 / 136 page

PIC16F716

DS41206B-page 68

9.8

Time-out Sequence

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

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 status of

the PWRT. For example, in RC mode with the PWRT

disabled, there will be no time-out at all. Figure 9-10,

Figure 9-11,

and

Figure 9-12

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

synchronize more than one PIC16F716 device

operating in parallel.

Table 9-5 shows the Reset conditions for some Special

Function Registers, while Table 9-6 shows the Reset

conditions for all the registers.

9.9

Power Control/STATUS Register

(PCON)

The Power Control/STATUS Register, PCON has two

bits.

Bit 0 is the Brown-out Reset Status bit, BOR. If the

BOREN Configuration bit is set, BOR is ‘1’ on

Power-on Reset and reset to ‘0’ when a Brown-out con-

dition occurs. BOR must then be set by the user and

checked on subsequent resets to see if it is clear, indi-

cating that another Brown-out has occurred.

If the BOREN Configuration bit is clear, BOR is

unknown on Power-on Reset.

Bit 1 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 9-3:

TIME-OUT IN VARIOUS SITUATIONS

TABLE 9-4:

STATUS BITS AND THEIR SIGNIFICANCE

Oscillator Configuration

Power-up or Brown-out

Wake-up from Sleep

PWRTE = 0

PWRTE = 1

XT, HS, LP

72 ms + 1024 TOSC

1024 TOSC

72 ms

—

POR

BOR

Power-on Reset (BOREN = 0)

Power-on Reset (BOREN = 1)

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

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