PIC18CXX2_13 Datasheet, PDF (248/304 Pages) Microchip Technology – High Performance Microcontrollers with 10-bit A/D

PIC18CXX2
FIGURE 21-7:
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 21-4 for load conditions.
30
31
34
34
FIGURE 21-8:
BROWN-OUT RESET TIMING
VDD
BVDD
35
VIRVST
Enable Internal Reference Voltage
Internal Reference Voltage Stable
36
VBGAP = 1.2V
TABLE 21-7: 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
7
18
33
ms
(No Postscaler)
32
TOST Oscillation Start-up Timer Period 1024TOSC — 1024TOSC — TOSC = OSC1 period
33
TPWRT Power up Timer Period
28
72
132
ms
34
TIOZ
I/O Hi-impedance from MCLR
Low or Watchdog Timer Reset
—
2
—
s
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
DS39026D-page 248
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