PIC18F2685T-I/SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F2685T-I/SP

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

Microchip Technology 

PIC18F2682/2685/4682/4685

FIGURE 27-7:

RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND

POWER-UP TIMER TIMING

VDD

MCLR

Internal

30

POR

PWRT

Time-out

33

32

OSC

Time-out

Internal

Reset

Watchdog

Timer

Reset

31

34

I/O pins

Note: Refer to Figure 27-4 for load conditions.

FIGURE 27-8:

BROWN-OUT RESET TIMING

VDD

VIRVST

Enable Internal

Reference Voltage

Internal Reference

Voltage Stable

BVDD

35

36

34

VBGAP = 1.2V

TABLE 27-10: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER

AND BROWN-OUT RESET REQUIREMENTS

Param.

No.

Sym

Characteristic

Min

Typ

Max

Units

Conditions

30

TMCL MCLR Pulse Width (low)

2

—

—

μs

31

TWDT Watchdog Timer Time-out Period (no

3.4

4.00

4.6

ms

postscaler)

32

TOST Oscillation Start-up Timer Period

1024 TOSC — 1024 TOSC — TOSC = OSC1 period

33

TPWRT Power-up Timer Period

55.6 65.5

75

ms

34

TIOZ I/O High-Impedance from MCLR Low

—

2

—

μs

or Watchdog Timer Reset

35

TBOR Brown-out Reset Pulse Width

200

—

—

μs VDD ≤ BVDD (see D005)

36

TIRVST Time for Internal Reference Voltage to

—

20

50

μs

become stable

37

TLVD High/Low-Voltage Detect Pulse Width 200

—

—

μs VDD ≤ VLVD

38

TCSD CPU Start-up Time

—

10

—

μs

39

TIOBST Time for INTOSC to stabilize

—

1

—

μs

DS39761B-page 438

Preliminary

© 2007 Microchip Technology Inc.

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