PIC16F877T-04/SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F877T-04/SP

28/40-Pin 8-Bit CMOS FLASH Microcontrollers

Microchip Technology 

PIC16F87X

FIGURE 15-8:

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

33

32

I/O Pins

Note: Refer to Figure 15-5 for load conditions.

30

31

34

34

FIGURE 15-9:

BROWN-OUT RESET TIMING

VDD

VBOR

35

TABLE 15-3: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER,

AND BROWN-OUT RESET REQUIREMENTS

Parameter

No.

Symbol

Characteristic

Min

Typ†

Max Units

Conditions

30

TmcL MCLR Pulse Width (low)

2

31*

Twdt Watchdog Timer Time-out Period

7

(No Prescaler)

—

—

µs VDD = 5V, -40°C to +85°C

18

33

ms VDD = 5V, -40°C to +85°C

32

Tost Oscillation Start-up Timer Period

— 1024 TOSC —

— TOSC = OSC1 period

33*

Tpwrt Power-up Timer Period

28

72

132 ms VDD = 5V, -40°C to +85°C

34

TIOZ I/O Hi-impedance from MCLR Low —

—

2.1

µs

or Watchdog Timer Reset

35

TBOR Brown-out Reset pulse width

100

—

—

µs VDD ≤ VBOR (D005)

* 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.

DS30292C-page 164

 2001 Microchip Technology Inc.

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