Information

 2010 Microchip Technology Inc. DS41303G-page 389
PIC18F2XK20/4XK20
FIGURE 26-9: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 26-11: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Note: Refer to Figure 26-4 for load conditions.
46
47
45
48
41
42
40
T0CKI
T1OSO/T13CKI
TMR0 or
TMR1
Param
No.
Symbol Characteristic Min Max Units Conditions
40 Tt0H T0CKI High Pulse Width No prescaler 0.5 T
CY + 20 — ns
With prescaler 10 — ns
41 Tt0L T0CKI Low Pulse Width No prescaler 0.5 T
CY + 20 — ns
With prescaler 10 — ns
42 Tt0P T0CKI Period No prescaler TCY + 10 — ns
With prescaler Greater of:
20 ns or
(T
CY + 40)/N
— ns N = prescale
value
(1, 2, 4,..., 256)
45 Tt1H T13CKI
High Time
Synchronous, no prescaler 0.5 T
CY + 20 — ns
Synchronous,
with prescaler
10 — ns
Asynchronous 30 — ns
46 Tt1L T13CKI Low
Time
Synchronous, no prescaler 0.5 T
CY + 5 — ns
Synchronous,
with prescaler
10 — ns
Asynchronous 30 — ns
47 Tt1P T13CKI
Input Period
Synchronous Greater of:
20 ns or
(T
CY + 40)/N
— ns N = prescale
value (1, 2, 4, 8)
Asynchronous 60 — ns
Ft1 T13CKI Clock Input Frequency Range DC 50 kHz
48 Tcke2tmrI Delay from External T13CKI Clock Edge to
Timer Increment
2 T
OSC 7 TOSC —