PIC16CR74ESLASHSP datasheet(95/172 Pages) MICROCHIP

95 / 172 page

DS21993C-page 93

PIC16CR7X

12.3

Reset

The PIC16CR7X 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 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), 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 differ-

ently in different Reset situations, 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

VDD 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

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

Brown-out

Reset

BODEN

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