PIC16F767T-E/ML View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F767T-E/ML

28/40/44-Pin, 8-Bit CMOS Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC16F7X7

15.2 Reset

The PIC16F7X7 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

differently in different Reset situations, as indicated in

Table 15-3. These bits are used in software to

determine the nature of the Reset. Upon a POR, BOR

or wake-up from Sleep, the CPU requires approxi-

mately 5-10 µs to become ready for code execution.

This delay runs in parallel with any other timers. See

Table 15-4 for a full description of Reset states of all

registers.

A simplified block diagram of the On-Chip Reset Circuit

is shown in Figure 15-1.

FIGURE 15-1:

SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT

External

Reset

MCLR/VPP/RE3 pin

Sleep

WDT

Module

WDT

Time-out

Reset

VDD Rise

Detect

VDD

Power-on Reset

Brown-out

Detect

BOREN

BORSEN

S

OST/PWRT

OST

10-bit Ripple Counter

R

OSC1/

CLKI pin

INTRC(1)

PWRT

11-bit Ripple Counter

Chip_Reset

Q

Enable PWRT

Enable OST

Note 1: This is the 32 kHz INTRC oscillator. See Section 4.0 “Oscillator Configurations” for more information.

DS30498C-page 172

 2004 Microchip Technology Inc.

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