PIC18F258-I/SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F258-I/SP

28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

Microchip Technology 

PIC18FXX8

FIGURE 27-10: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS

T0CKI

T1OSO/T1CKI

40

41

42

45

46

TMR0 or

TMR1

47

48

Note: Refer to Figure 27-5 for load conditions.

TABLE 27-10: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS

Param

No.

Symbol

Characteristic

Min

Max Units Conditions

40 Tt0H T0CKI High Pulse Width No prescaler 0.5 TCY + 20

—

With prescaler

10

—

41

Tt0L

T0CKI Low Pulse Width

No prescaler 0.5 TCY + 20

—

With prescaler

10

—

42 Tt0P T0CKI Period

No prescaler

TCY + 10

—

With prescaler Greater of:

—

20 ns or TCY + 40

N

45 Tt1H T1CKI

Synchronous, no prescaler

0.5 TCY + 20

—

High Time Synchronous, PIC18FXX8

10

—

with prescaler PIC18LFXX8

25

—

Asynchronous PIC18FXX8

30

—

PIC18LFXX8

50

—

46

Tt1L

T1CKI

Synchronous, no prescaler

0.5 TCY + 5

—

Low Time Synchronous, PIC18FXX8

10

—

with prescaler PIC18LFXX8

25

—

Asynchronous PIC18FXX8

30

—

PIC18LFXX8

TBD

TBD

47 Tt1P T1CKI

Synchronous

Input Period

Greater of:

—

20 ns or TCY + 40

N

Asynchronous

60

—

Ft1

T1CKI Oscillator Input Frequency Range

DC

50

48 Tcke2tmrI Delay from External T1CKI Clock Edge to

Timer Increment

2 TOSC

7 TOSC

Legend: TBD = To Be Determined

ns

ns

ns

ns

ns

ns N = prescale value

(1, 2, 4,..., 256)

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns N = prescale value

(1, 2, 4, 8)

ns

kHz

—

DS41159E-page 346

© 2006 Microchip Technology Inc.

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