PIC18FXX8 Datasheet, PDF (348/402 Pages) Microchip Technology – 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

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
—
DS41159D-page 346
 2004 Microchip Technology Inc.