PIC16F87 datasheet(179/230 Pages) MICROCHIP

179 / 230 page

 2002-2013 Microchip Technology Inc.

DS30487D-page 179

PIC16F87/88

FIGURE 18-6:

RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND

POWER-UP TIMER TIMING

FIGURE 18-7:

BROWN-OUT RESET TIMING

TABLE 18-5:

RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER

AND BROWN-OUT RESET REQUIREMENTS

Parameter

No.

Sym

Characteristic

Min

Typ†

Max

Units

Conditions

TmcL

MCLR Pulse Width (Low)

—

sVDD = 5V, -40°C to +85°C

31*

TWDT

Watchdog Timer Time-out Period

(16-bit prescaler = 0100 and no

postscaler)

13.6

18.4

VDD = 5V, -40°C to +85°C

TOST

Oscillation Start-up Timer Period

—

1024 TOSC

——

TOSC = OSC1 period

33*

TPWRT

Power-up Timer Period

61.2

82.8

VDD = 5V, -40°C to +85°C

TIOZ

I/O High-impedance from MCLR

Low or Watchdog Timer Reset

——

2.1

s

TBOR

Brown-out Reset Pulse Width

100

—

sVDD  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.

VDD

MCLR

Internal

POR

PWRT

Time-out

Oscillator

Time-out

Internal

Reset

Watchdog

Timer

Reset

I/O Pins

Note: Refer to Figure 18-3 for load conditions.

VDD

VBOR

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