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PIC18F242 Datasheet(PDF) 277 Page - Microchip Technology

Part # PIC18F242
Description  High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D
PDF  332 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F242 Datasheet(HTML) 277 Page - Microchip Technology

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© 2006 Microchip Technology Inc.
DS39564C-page 275
PIC18FXX2
FIGURE 22-9:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 22-8:
TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Note:
Refer to Figure 22-4 for load conditions.
46
47
45
48
41
42
40
T0CKI
T1OSO/T1CKI
TMR0 or
TMR1
Param
No.
Symbol
Characteristic
Min
Max
Units
Conditions
40
Tt0H
T0CKI High Pulse Width
No Prescaler
0.5TCY + 20
—
ns
With Prescaler
10
—
ns
41
Tt0L
T0CKI Low Pulse Width
No Prescaler
0.5TCY + 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
Time
Synchronous, no prescaler
0.5TCY + 20
—
ns
Synchronous,
with prescaler
PIC18FXXX
10
—
ns
PIC18LFXXX
25
—
ns
Asynchronous
PIC18FXXX
30
—
ns
PIC18LFXXX
50
—
ns
46
Tt1L
T1CKI Low
Time
Synchronous, no prescaler
0.5TCY + 5
—
ns
Synchronous,
with prescaler
PIC18FXXX
10
—
ns
PIC18LFXXX
25
—
ns
Asynchronous
PIC18FXXX
30
—
ns
PIC18LFXXX
50
—
ns
47
Tt1P
T1CKI input
period
Synchronous
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
increment
2 TOSC
7 TOSC
—



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