PIC18F6X2X Datasheet, PDF (345/386 Pages) Microchip Technology – 64/80-Pin High Performance, 64-Kbyte Enhanced FLASH Microcontrollers with A/D

PIC18F6X2X/8X2X
FIGURE 27-9:
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 27-4 for load conditions.
30
34
31
34
FIGURE 27-10: BROWN-OUT RESET TIMING
VDD
BVDD
35
VIRVST
Enable Internal Reference Voltage
Internal Reference Voltage stable
36
VBGAP = 1.2V
TABLE 27-11: 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
—
—
µs
31
TWDT Watchdog Timer Time-out Period
(No Postscaler)
7
18
33
ms
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
—
µs
or Watchdog Timer Reset
35
TBOR Brown-out Reset Pulse Width
200
—
—
µs VDD ≤ BVDD (see D005)
36
TIVRST Time for Internal Reference
Voltage to become stable
—
20
50
µs
37
TLVD Low Voltage Detect Pulse Width
200
—
—
µs VDD ≤ VLVD
 2003 Microchip Technology Inc.
Advance Information
DS39612A-page 343