PIC12F635-ISLASHST datasheet(186/234 Pages) MICROCHIP

186 / 234 page

PIC12F635/PIC16F636/639

DS41232D-page 184

FIGURE 15-9:

TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS

TABLE 15-5:

TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS

Standard Operating Conditions (unless otherwise stated)

Operating Temperature

-40°C

≤ TA ≤ +125°C

Param

No.

Sym

Characteristic

Min

Typ†

Max

Units

Conditions

40*

TT0H

T0CKI High Pulse Width

No Prescaler

0.5 TCY + 20

—

With Prescaler

—

41*

TT0L

T0CKI Low Pulse Width

No Prescaler

0.5 TCY + 20

—

With Prescaler

—

42*

TT0P

T0CKI Period

Greater of:

20 or TCY + 40

—

N = prescale value

(2, 4, ..., 256)

45*

TT1H

T1CKI High

Time

Synchronous, No Prescaler

0.5 TCY + 20

—

Synchronous,

with Prescaler

—

Asynchronous

—

46*

TT1L

T1CKI Low

Time

Synchronous, No Prescaler

0.5 TCY + 20

—

Synchronous,

with Prescaler

—

Asynchronous

—

47*

TT1P

T1CKI Input

Period

Synchronous

Greater of:

30 or TCY + 40

—

N = prescale value

(1, 2, 4, 8)

Asynchronous

—

FT1

Timer1 Oscillator Input Frequency Range

(oscillator enabled by setting bit T1OSCEN)

—

32.768

—

kHz

49*

TCKEZTMR1 Delay from External Clock Edge to Timer

Increment

2 TOSC

—7 TOSC

—

Timers in Sync

mode

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.

T0CKI

T1CKI

TMR0 or

TMR1

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