Datasheet

© 2009 Microchip Technology Inc. DS39682E-page 323
PIC18F45J10 FAMILY
FIGURE 24-8: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 24-11: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Symbol Characteristic Min Max Units Conditions
40 T
T0H 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 T
T0P T0CKI Period No prescaler TCY + 10 — ns
With prescaler Greater of:
20 ns or
(TCY + 40)/N
—nsN = prescale
value
(1, 2, 4,..., 256)
45 TT1H T1CKI High
Time
Synchronous, no prescaler 0.5 TCY + 20 — ns
Synchronous, with prescaler 10 — ns
Asynchronous 30 — ns
46 T
T1L T1CKI Low
Time
Synchronous, no prescaler 0.5 TCY + 5 — ns
Synchronous, with prescaler 10 — ns
Asynchronous 30 — ns
47 T
T1P T1CKI Input
Period
Synchronous Greater of:
20 ns or
(TCY + 40)/N
—nsN = prescale
value
(1, 2, 4, 8)
Asynchronous 60 — ns
FT1 T1CKI Oscillator Input Frequency Range DC 50 kHz
48 T
CKE2TMRI Delay from External T1CKI Clock Edge to
Timer Increment
2 TOSC 7 TOSC —
Note: Refer to Figure 24-3 for load conditions.
46
47
45
48
41
42
40
T0CKI
T1OSO/T1CKI
TMR0 or
TMR1