PIC18LF4420T-I/SO 查看數據表（PDF） - Microchip Technology

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PIC18LF4420T-I/SO

28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F2420/2520/4420/4520

FIGURE 26-7:

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 26-4 for load conditions.

30

31

34

34

FIGURE 26-8:

BROWN-OUT RESET TIMING

VDD

BVDD

35

VIRVST

Enable Internal

Reference Voltage

Internal Reference

Voltage Stable

36

VBGAP = 1.2V

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

30

TmcL MCLR Pulse Width (low)

2

—

—

31

TWDT Watchdog Timer Time-out Period

(no postscaler)

—

4.00 TBD

32

TOST Oscillation Start-up Timer Period 1024 TOSC — 1024 TOSC

33

TPWRT Power-up Timer Period

—

65.5 TBD

34

TIOZ I/O High-Impedance from MCLR

Low or Watchdog Timer Reset

—

2

—

35

TBOR Brown-out Reset Pulse Width

200

—

—

36

TIVRST Time for Internal Reference

Voltage to become Stable

—

20

50

37

TLVD High/Low-Voltage Detect Pulse Width 200

—

—

38

TCSD CPU Start-up Time

5

—

10

39

TIOBST Time for INTOSC to Stabilize

—

1

—

Legend: TBD = To Be Determined

µs

ms

— TOSC = OSC1 period

ms

µs

µs VDD ≤ BVDD (see D005)

µs

µs VDD ≤ VLVD

µs

ms

 2004 Microchip Technology Inc.

Preliminary

DS39631A-page 345

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