PIC17C4X Datasheet, PDF (186/240 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM/ROM Microcontroller

PIC17C4X
Applicable Devices 42 R42 42A 43 R43 44
FIGURE 19-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, AND POWER-UP
TIMER TIMING
VDD
MCLR
Internal
POR
33
PWRT
Timeout
OSC ³²
Timeout
Internal
RESET
Watchdog
Timer
RESET
Address /
Data
30
31
35
TABLE 19-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP
TIMER REQUIREMENTS
Parameter
No.
Sym Characteristic
Min Typ†
Max Units
Conditions
30
31
32
33
35
*
†
‡
§
TmcL MCLR Pulse Width (low)
100 *
—
—
ns VDD = 5V
Twdt Watchdog Timer Time-out Period
(Prescale = 1)
5*
12
25 * ms VDD = 5V
Tost Oscillation Start-up Timer Period
— 1024TOSC§ — ms TOSC = OSC1 period
Tpwrt Power-up Timer Period
40 *
96
200 * ms VDD = 5V
TmcL2adI MCLR to System Inter- ^{PIC17CR42/42A/} —
face bus (AD15:AD0>) ^43/R43/44
invalid
PIC17LCR42/
—
42A/43/R43/44
—
100 * ns
—
120 * 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.
DS30412C-page 186
© 1996 Microchip Technology Inc.