Datasheet

MCP19111
DS22331A-page 30  2013 Microchip Technology Inc.
FIGURE 5-5: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 5-3: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, AND POWER-UP
TIMER REQUIREMENTS
Param
No.
Sym Characteristic Min Typ
†
Max Units Conditions
30 T
MCL
MCLR Pulse Width (low) 2 — — µs V
DD
= 5V, -40°C to +85°C
31 T
WDT
Watchdog Timer Time-out
Period (No Prescaler)
71833msV
DD
= 5V, -40°C to +85°C
32 T
OST
Oscillation Start-up Timer
Period
— 1024T
OSC
——T
OSC
= OSC1 period
33* T
PWRT
Power up Timer Period
(4 x T
WDT
)
28 64 132 ms V
DD
= 5V, -40°C to +85°C
34 T
IOZ
I/O high-impedance from MCLR
Low or Watchdog Timer Reset
——2.0µs
* These parameters are characterized but not tested.
† Data in “Typ” column is at V
IN
=12V (V
DD
= 5V), +25°C unless otherwise stated. These parameters are for
design guidance only and are not tested.
TABLE 5-4: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Sym Characteristic Min Typ
†
Max Units Conditions
40* Tt0H T0CKI High Pulse Width No Prescaler 0.5T
CY
+ 20 — — ns
With Prescaler 10 — — ns
41* Tt0L T0CKI Low Pulse Width No Prescaler 0.5T
CY
+ 20 — — ns
With Prescaler 10 — — ns
42* Tt0P T0CKI Period Greater of:
20 or T
CY + 40
N
— — ns N = prescale value
(2, 4, ..., 256)
* These parameters are characterized but not tested.
† Data in “Typ” column is at V
IN
=12V (V
DD
= 5V), +25°C unless otherwise stated. These parameters are for
design guidance only and are not tested.
41
42
40
T0CKI