PIC16C432-I View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C432-I

OTP 8-Bit CMOS MCU with LIN Transceiver

Microchip Technology 

PIC16C432

9.3 RESET

The PIC16C432 differentiates between various kinds of

RESET:

a) Power-on Reset (POR)

b) MCLR Reset during normal operation

c) MCLR Reset during SLEEP

d) WDT Reset (normal operation)

e) WDT wake-up (SLEEP)

f) Brown-out Reset (BOD)

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, MCLR Reset,

WDT Reset and MCLR Reset during SLEEP. They are

not affected by a WDT wake-up, since this is viewed as

the resumption of normal operation. TO and PD bits are

set or cleared differently in different RESET situations,

as indicated in Table 9-4. These bits are used in soft-

ware to determine the nature of the RESET. See

Table 9-6 for a full description of RESET states of all

registers.

A simplified block diagram of the On-chip Reset Circuit

is shown in Figure 9-6.

The MCLR Reset path has a noise filter to detect and

ignore small pulses. See Table 12-6 for pulse width

specification.

FIGURE 9-6:

SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT

External

Reset

MCLR/

VPP pin

VDD

WDT

Module

SLEEP

WDT

Timeout

Reset

VDD Rise

Detect

Power-on Reset

Brown-out

Reset

BODEN

OSC1/

CLKIN

pin

OST/PWRT

OST

10-bit Ripple-counter

PWRT

On-chip(1)

RC OSC

10-bit Ripple-counter

S

Chip_Reset

R

Q

Enable PWRT

Enable OST

See Table 9-3 for timeout situations.

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

 2000-2013 Microchip Technology Inc.

Preliminary

DS41140C-page 47

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