PIC16F57 datasheet(25/90 Pages) MICROCHIP

25 / 90 page

 2004 Microchip Technology Inc.

DS41213C-page 23

PIC16F5X

5.0

RESET

The PIC16F5X devices may be reset in one of the

following ways:

• Power-on Reset (POR)

•MCLR Reset (normal operation)

•MCLR Wake-up Reset (from Sleep)

• WDT Reset (normal operation)

• WDT Wake-up Reset (from Sleep)

Table 5-1 shows these Reset conditions for the PCL

and Status registers.

Some registers are not affected in any Reset condition.

Their status is unknown on POR and unchanged in any

other Reset. Most other registers are reset to a “Reset

state” on Power-on Reset (POR), MCLR or WDT

Reset. A MCLR or WDT wake-up from Sleep also

results in a device Reset and not a continuation of

operation before Sleep.

The TO and PD bits (Status <4:3>) are set or cleared

depending on the different Reset conditions (Table 5-1).

These bits may be used to determine the nature of the

Reset.

Table 5-3 lists a full description of Reset states of all

registers. Figure 5-1 shows a simplified block diagram

of the on-chip Reset circuit.

TABLE 5-1:

STATUS BITS AND THEIR SIGNIFICANCE

TABLE 5-2:

SUMMARY OF REGISTERS ASSOCIATED WITH RESET

Condition

Power-on Reset

MCLR Reset (normal operation)

MCLR Wake-up (from Sleep)

WDT Reset (normal operation)

WDT Wake-up (from Sleep)

Legend: u = unchanged, x = unknown, — = unimplemented read as ‘0’.

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR

Value on

MCLR and

WDT Reset

03h

STATUS

PA2

PA1

PA0

0001 1xxx

000q quuu

Legend: u = unchanged, x = unknown, q = see Table 5-1 for possible values.

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