PIC17C4X Datasheet, PDF (157/240 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM/ROM Microcontroller

PIC17C4X
Applicable Devices 42 R42 42A 43 R43 44
FIGURE 17-4: 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
Address /
Data
33
32
30
31
35
TABLE 17-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP
TIMER REQUIREMENTS
Parameter
No.
Sym Characteristic
Min
Typ†
Max Units
Conditions
30
TmcL MCLR Pulse Width (low)
100 *
—
— ns
31
Twdt Watchdog Timer Time-out Period 5 *
12
25 * ms
(Prescale = 1)
32
Tost Oscillation Start-up Timer Period
1024 TOSC §
ms TOSC = OSC1 period
33
Tpwrt Power-up Timer Period
40 *
96
200 * ms
35
TmcL2adI MCLR to System Interface bus
—
(AD15:AD0) invalid
—
100 * ns
*
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.
‡
These parameters are for design guidance only and are not tested, nor characterized.
§
This specification ensured by design.
© 1996 Microchip Technology Inc.
DS30412C-page 157