PIC18LF4550T-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF4550T-I/SO

28/40/44-Pin, High-Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC18F2455/2550/4455/4550

FIGURE 28-7:

RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND

POWER-UP TIMER TIMING

VDD

MCLR

Internal

POR

PWRT

Time-out

Oscillator

Time-out

Internal

Reset

Watchdog

Timer

Reset

33

32

I/O pins

Note: Refer to Figure 28-4 for load conditions.

30

31

34

34

FIGURE 28-8:

BROWN-OUT RESET TIMING

VDD

VIRVST

Enable Internal

Reference Voltage

Internal Reference

Voltage Stable

BVDD

35

36

VBGAP = 1.2V

TABLE 28-12: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER

AND BROWN-OUT RESET REQUIREMENTS

Param.

No.

Symbol

Characteristic

Min Typ Max Units

Conditions

30

TmcL MCLR Pulse Width (low)

2

—

—

μs

31

TWDT Watchdog Timer Time-out Period

3.5

4.1

4.8

ms

(no postscaler)

32

TOST Oscillator Start-up Timer Period 1024 TOSC — 1024 TOSC — TOSC = OSC1 period

33

TPWRT Power-up Timer Period

57.0 65.5 77.1

ms

34

TIOZ I/O High-Impedance from MCLR

Low or Watchdog Timer Reset

—

2

—

μs

35

TBOR Brown-out Reset Pulse Width

200

—

—

μs VDD ≤ BVDD (see D005)

36

TIRVST Time for Internal Reference

Voltage to become Stable

—

20

50

μs

37

TLVD Low-Voltage Detect Pulse Width

200

—

—

μs VDD ≤ VLVD

38

TCSD CPU Start-up Time

5

—

10

μs

39

TIOBST Time for INTOSC to Stabilize

—

1

—

ms

DS39632E-page 390

© 2009 Microchip Technology Inc.

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