PIC18F2450-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F2450-I/SO

24/40/44-Pin High-Performance, 12 MIPS, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC18F2450/4450

FIGURE 21-9:

TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS

T0CKI

T1OSO/T1CKI

40

41

42

45

46

47

48

TMR0 or

TMR1

Note: Refer to Figure 21-4 for load conditions.

TABLE 21-11: 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 — ns

With prescaler

10

— ns

41 Tt0L

T0CKI Low Pulse Width

No prescaler 0.5 TCY + 20 — ns

With prescaler

10

— ns

42

Tt0P

T0CKI Period

No prescaler

TCY + 10

— ns

With prescaler Greater of: —

20 ns or

(TCY + 40)/N

ns N = prescale

value

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

45 Tt1H T1CKI High Synchronous, no prescaler

0.5 TCY + 20 —

ns

Time

Synchronous, PIC18FXXXX

10

— ns

with prescaler PIC18LFXXXX

25

—

ns VDD = 2.0V

Asynchronous PIC18FXXXX

30

— ns

PIC18LFXXXX

50

—

ns VDD = 2.0V

46 Tt1L

T1CKI Low Synchronous, no prescaler

0.5 TCY + 5 —

Time

Synchronous, PIC18FXXXX

10

—

with prescaler PIC18LFXXXX

25

—

ns

ns

ns VDD = 2.0V

Asynchronous PIC18FXXXX

30

— ns

PIC18LFXXXX

50

—

ns VDD = 2.0V

47

Tt1P

T1CKI Input Synchronous

Period

Greater of: —

20 ns or

(TCY + 40)/N

ns N = prescale

value (1, 2, 4, 8)

Asynchronous

60

— ns

Ft1

T1CKI Oscillator Input Frequency Range

DC

50 kHz

48 Tcke2tmrI Delay from External T1CKI Clock Edge to Timer 2 TOSC 7 TOSC —

Increment

© 2008 Microchip Technology Inc.

DS39760D-page 289

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