PIC18F8520-IPT301 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F8520-IPT301

64/80-Pin High-Performance, 256 Kbit to 1 MbitEnhanced Flash Microcontrollers with A/D

Microchip Technology 

PIC18F6520/8520/6620/8620/6720/8720

FIGURE 26-12: BROWN-OUT RESET TIMING

VDD

VIRVST

BVDD

35

Enable Internal

Reference Voltage

Internal Reference

Voltage Stable

36

VBGAP = 1.2V

TABLE 26-11: 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

—

—

s

31

TWDT Watchdog Timer Time-out Period (no

7

18

33

ms

postscaler)

32

TOST

Oscillation Start-up Timer Period

1024 TOSC — 1024 TOSC — TOSC = OSC1 period

33

TPWRT Power-up Timer Period

28

72

132

ms

34

TIOZ

I/O High-Impedance from MCLR Low

—

2

—

s

or Watchdog Timer Reset

35

TBOR Brown-out Reset Pulse Width

200

—

—

s VDD  BVDD (see D005)

36

TIVRST Time for Internal Reference

Voltage to become stable

—

20

50

s

37

TLVD

Low-Voltage Detect Pulse Width

200

—

—

s VDD  VLVD

FIGURE 26-13: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS

T0CKI

T1OSO/T13CKI

40

41

42

45

46

47

48

TMR0 or

TMR1

Note: Refer to Figure 26-6 for load conditions.

 2003-2013 Microchip Technology Inc.

DS39609C-page 325

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