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 2002 Microchip Technology Inc. DS30325B-page 93

PIC16F7X

12.3 RESET

The PIC16F7X differentiates between various kinds of

RESET:

• Power-on Reset (POR)

• MCLR

Reset during normal operation

• MCLR

Reset during SLEEP

• WDT Reset (during normal operation)

• WDT Wake-up (during SLEEP)

• Brown-out Reset (BOR)

Some registers are not affected in any RESET condi-

tion. 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), on the

MCLR and WDT Reset, on MCLR Reset during

SLEEP, and Brown-out Reset (BOR). They are not

affected by a WDT Wake-up, which is viewed as the

resumption of normal operation. The TO

and PD bits

are set or cleared differently in different RESET situa-

tions, as indicated in Table 12-4. These bits are used in

software to determine the nature of the RESET. See

Table 12-6 for a full description of RESET states of all

registers.

A simplified block diagram of the on-chip RESET circuit

is shown in Figure 12-4.

FIGURE 12-4: SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT

External

RESET

MCLR

VDD

OSC1

WDT

Module

DD Rise

Detect

OST/PWRT

On-chip

RC OSC

WDT

Time-out

Power-on Reset

OST

10-bit Ripple Counter

PWRT

Chip_Reset

10-bit Ripple Counter

Reset

Enable OST

Enable PWRT

SLEEP

Note 1: This is a separate oscillator from the RC oscillator of the CLKIN pin.

Brown-out

Reset

BODEN

(1)

1 2 ... 90 91 92 93 94 95 96 97 98 99 100 ... 173 174

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