PIC17CR42 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC17CR42

High-Performance 8-Bit CMOS EPROM/ROM Microcontroller

Microchip Technology 

PIC17C4X

Applicable Devices 42 R42 42A 43 R43 44

FIGURE 17-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP

TIMER TIMING

VDD

MCLR

Internal

POR

PWRT

Time-out

OSC

Time-out

Internal

RESET

Watchdog

Timer

RESET

Address /

Data

33

32

30

31

35

TABLE 17-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP

TIMER REQUIREMENTS

Parameter

No.

Sym Characteristic

Min

Typ†

Max Units

Conditions

30

TmcL MCLR Pulse Width (low)

100 *

—

— ns

31

Twdt Watchdog Timer Time-out Period 5 *

12

25 * ms

(Prescale = 1)

32

Tost Oscillation Start-up Timer Period

1024 TOSC §

ms TOSC = OSC1 period

33

Tpwrt Power-up Timer Period

40 *

96

200 * ms

35

TmcL2adI MCLR to System Interface bus

—

(AD15:AD0) invalid

—

100 * ns

*

These parameters are characterized but not tested.

†

Data in “Typ” column is at 5V, 25˚C unless otherwise stated. These parameters are for design guidance only and are not

tested.

‡

These parameters are for design guidance only and are not tested, nor characterized.

§

This specification ensured by design.

© 1996 Microchip Technology Inc.

DS30412C-page 157

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