PIC16C7X Datasheet, PDF (209/288 Pages) Microchip Technology – 8-Bit CMOS Microcontrollers with A/D Converter

PIC16C7X
Applicable Devices 72 73 73A 74 74A 76 77
FIGURE 19-4: 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
I/O Pins
33
32
30
31
34
34
Note: Refer to Figure 19-1 for load conditions.
FIGURE 19-5: BROWN-OUT RESET TIMING
VDD
BVDD
35
TABLE 19-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER,
AND BROWN-OUT RESET REQUIREMENTS
Parameter
No.
Sym Characteristic
Min
Typ†
Max Units
Conditions
30
TmcL MCLR Pulse Width (low)
2
—
—
µs VDD = 5V, -40˚C to +125˚C
31*
Twdt Watchdog Timer Time-out Period
7
18
33 ms VDD = 5V, -40˚C to +125˚C
(No Prescaler)
32
Tost Oscillation Start-up Timer Period
— 1024TOSC —
— TOSC = OSC1 period
33*
Tpwrt Power up Timer Period
28
72
132 ms VDD = 5V, -40˚C to +125˚C
34
TIOZ I/O Hi-impedance from MCLR Low —
—
2.1 µs
or Watchdog Timer Reset
35
TBOR Brown-out Reset pulse width
100
—
—
µs VDD ≤ BVDD (D005)
*
These parameters are characterized but not tested.
†
Data in "Typ" column is at 5V, 25˚C unless otherwise stated. These parameters are for design guidance only and are not
tested.
© 1997 Microchip Technology Inc.
DS30390E-page 209