PIC16C72-04SLASHSP datasheet(64/124 Pages) MICROCHIP

64 / 124 page

PIC16C72 Series

DS39016A-page 64

Preliminary

10.8

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 10-7,

Figure 10-8, Figure 10-9 and Figure 10-10 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 10-9). This is useful for testing purposes or to

synchronize more than one PIC16CXXX family device

operating in parallel.

Table 10-5 shows the reset conditions for some special

function registers, while Table 10-6 shows the reset

conditions for all the registers.

10.9

Power Control/Status Register

(PCON)

The Power Control/Status Register, PCON has up to

two bits, depending upon the device.

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 BOR occurred. The BOR bit

is a "Don’t Care" bit and is not necessarily predictable

if the Brown-out Reset circuitry is disabled (by clearing

bit BODEN in the Conﬁguration Word).

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 10-3

TIME-OUT IN VARIOUS SITUATIONS

TABLE 10-4

STATUS BITS AND THEIR SIGNIFICANCE

TABLE 10-5

RESET CONDITION FOR SPECIAL REGISTERS

Oscillator Conﬁgura-

tion

Power-up

Brown-out

Wake-up from

SLEEP

PWRTE = 0

PWRTE = 1

XT, HS, LP

72 ms +

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

---- --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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