PIC18F2420-ESLASHP datasheet(347/412 Pages) MICROCHIP

347 / 412 page

DS39631E-page 345

PIC18F2420/2520/4420/4520

FIGURE 26-8:

RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND

POWER-UP TIMER TIMING

FIGURE 26-9:

BROWN-OUT RESET TIMING

TABLE 26-10: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER

AND BROWN-OUT RESET REQUIREMENTS

Param.

No.

Symbol

Characteristic

Min

Typ

Max

Units

Conditions

TmcL

MCLR Pulse Width (low)

—

μs

TWDT

Watchdog Timer Time-out Period

(no postscaler)

3.4

4.1

4.71

TOST

Oscillation Start-up Timer Period

1024 TOSC

—

1024 TOSC

—TOSC = OSC1 period

TPWRT Power-up Timer Period

55.6

65.5

75.4

TIOZ

I/O High-Impedance from MCLR

Low or Watchdog Timer Reset

—2

—

μs

TBOR

Brown-out Reset Pulse Width

200

—

μsVDD ≤ BVDD (see D005)

TIRVST Time for Internal Reference

Voltage to become Stable

—20

μs

TLVD

High/Low-Voltage Detect Pulse Width

200

—

μsVDD ≤ VLVD

TCSD

CPU Start-up Time

—

μs

TIOBST Time for INTOSC to Stabilize

—

μs

VDD

MCLR

Internal

POR

PWRT

Time-out

OSC

Time-out

Internal

Reset

Watchdog

Timer

Reset

I/O pins

Note:

Refer to Figure 26-5 for load conditions.

VDD

BVDD

VIRVST

Enable Internal

Internal Reference

Reference Voltage

Voltage Stable

PIC18F2420-E/P Datasheet(PDF) 347 Page - Microchip Technology

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