PIC18F25K20T-ISO Datasheet, PDF (389/456 Pages) Microchip Technology – 28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC18F2XK20/4XK20
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
High Time
Synchronous, no prescaler
Synchronous,
with prescaler
0.5 TCY + 20
—
ns
10
— ns
Asynchronous
30
— ns
46 Tt1L
T13CKI Low Synchronous, no prescaler
Time
Synchronous,
with prescaler
0.5 TCY + 5
—
ns
10
— ns
Asynchronous
30
— ns
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 Clock Input Frequency Range
DC
50 kHz
48 Tcke2tmrI Delay from External T13CKI Clock Edge to
Timer Increment
2 TOSC
7 TOSC —
 2010 Microchip Technology Inc.
DS41303G-page 389