PIC16F876A-I/SP【PDF 56/234 页】IC MCU FLASH 8KX14 EE 28DIP

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2003 Microchip Technology Inc.

DS39582B-page 147

PIC16F87XA

14.3

Reset

The PIC16F87XA 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 14-4. These bits are used in software to deter-

mine the nature of the Reset. See Table 14-6 for a full

description of Reset states of all registers.

A simplified block diagram of the on-chip Reset circuit

is shown in Figure 14-4.

FIGURE 14-4:

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 1:

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

Brown-out

Reset

BODEN

(1)

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