PIC18LF4420T-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF4420T-I/SO

28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F2420/2520/4420/4520

FIGURE 26-9:

TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS

T0CKI

T1OSO/T13CKI

40

41

42

45

46

47

48

TMR0 or

TMR1

Note: Refer to Figure 26-4 for load conditions.

TABLE 26-11: 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:

— ns N = prescale

20 ns or

value

(TCY + 40)/N

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

45 Tt1H

T13CKI

Synchronous, no prescaler

0.5 TCY + 20

—

ns

High 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

T13CKI Low Synchronous, no prescaler

0.5 TCY + 5

—

ns

Time

Synchronous, PIC18FXXXX

10

— ns

with prescaler PIC18LFXXXX

25

—

ns VDD = 2.0V

Asynchronous PIC18FXXXX

30

— ns

PIC18LFXXXX

50

—

ns VDD = 2.0V

47 Tt1P

T13CKI

Synchronous

Input Period

Greater of:

—

20 ns or

(TCY + 40)/N

ns N = prescale

value (1, 2, 4, 8)

Asynchronous

60

— ns

Ft1

T13CKI Oscillator Input Frequency Range

DC

50 kHz

48 Tcke2tmrI Delay from External T13CKI Clock Edge to

Timer Increment

2 TOSC

7 TOSC —

DS39631A-page 346

Preliminary

 2004 Microchip Technology Inc.

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