OPTION_REG datasheet(30/222 Pages) MICROCHIP

30 / 222 page

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

TMCL

MCLR Pulse Width (low)

—

µs

VDD = 5V, -40°C to +85°C

TWDT

Watchdog Timer Time-out

Period (No Prescaler)

718

VDD = 5V, -40°C to +85°C

TOST

Oscillation Start-up Timer

Period

—

1024TOSC

——

TOSC = OSC1 period

33*

TPWRT

Power up Timer Period

(4 x TWDT)

132

VDD = 5V, -40°C to +85°C

TIOZ

I/O high-impedance from MCLR

Low or Watchdog Timer Reset

——

2.0

µs

These parameters are characterized but not tested.

†

Data in “Typ” column is at VIN =12V (VDD = 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

0.5TCY + 20

—

With Prescaler

—

41*

Tt0L

T0CKI Low Pulse Width

No Prescaler

0.5TCY + 20

—

With Prescaler

—

42*

Tt0P

T0CKI Period

Greater of:

20 or TCY + 40

—

N = prescale value

(2, 4, ..., 256)

These parameters are characterized but not tested.

†

Data in “Typ” column is at VIN =12V (VDD = 5V), +25°C unless otherwise stated. These parameters are for

design guidance only and are not tested.

T0CKI

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