Datasheet

 2011 Microchip Technology Inc. DS39932D-page 491
PIC18F46J11 FAMILY
FIGURE 29-8: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 29-15: 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 T
T0L 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:
20 ns or
(T
CY + 40)/N
—nsN = prescale
value
(1, 2, 4,..., 256)
45 T
T1H T1CKI/T3CKI
High Time
Synchronous, no prescaler 0.5 TCY + 20 — ns
Synchronous, with prescaler 10 — ns
Asynchronous 30 — ns
46 T
T1L T1CKI/T3CKI
Low Time
Synchronous, no prescaler 0.5 TCY + 5 — ns
Synchronous, with prescaler 10 — ns
Asynchronous 30 — ns
47 T
T1P T1CKI/T3CKI
Input Period
Synchronous Greater of:
20 ns or
(T
CY + 40)/N
—nsN = prescale
value
(1, 2, 4, 8)
Asynchronous 83 — ns
F
T1 T1CKI Input Frequency Range
(1)
DC 12 MHz
48 T
CKE2TMRI Delay from External T1CKI Clock Edge to
Timer Increment
2 TOSC 7 TOSC —
Note 1: The Timer1 oscillator is designed to drive 32.768 kHz crystals. When T1CKI is used as a digital input,
frequencies up to 12 MHz are supported.
Note: Refer to Figure 29-4 for load conditions.
46
47
45
48
41
42
40
T0CKI
T1OSO/T1CKI
TMR0 or
TMR1