PIC18F258-ESLASHLSQTP datasheet(347/402 Pages) MICROCHIP

347 / 402 page

DS41159E-page 345

PIC18FXX8

FIGURE 27-8:

RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND

POWER-UP TIMER TIMING

FIGURE 27-9:

BROWN-OUT RESET AND LOW-VOLTAGE DETECT TIMING

TABLE 27-9:

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

BROWN-OUT RESET AND LOW-VOLTAGE DETECT REQUIREMENTS

Param

No.

Symbol

Characteristic

Min

Typ

Max

Units

Conditions

TmcL

MCLR Pulse Width (low)

—

μs

TWDT

Watchdog Timer Time-out Period

(no prescaler)

718

TOST

Oscillation Start-up Timer Period

1024 TOSC

—

1024 TOSC

—TOSC = OSC1 period

TPWRT

Power-up Timer Period

132

TIOZ

I/O High-Impedance from MCLR Low

or Watchdog Timer Reset

—2

—

μs

TBOR

Brown-out Reset Pulse Width

200

—

μsFor VDD ≤ BVDD (see D005)

TIRVST

Time for Internal Reference

Voltage to become stable

—20

μs

TLVD

Low-Voltage Detect Pulse Width

200

—

μsFor VDD ≤ VLVD (see D420)

VDD

MCLR

Internal

POR

PWRT

Time-out

Oscillator

Time-out

Internal

Reset

Watchdog

Timer

Reset

I/O Pins

Note: Refer to Figure 27-5 for load conditions.

VDD

BVDD (for 35)

35, 37

VBGAP = 1.2V

VIRVST

Enable Internal

Internal Reference

VLVD (for 37)

Reference Voltage

Voltage Stable

PIC18F258-E/LSQTP 데이터시트(PDF) 347 Page - Microchip Technology

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