PIC18CXX2_13 Datasheet, PDF (249/304 Pages) Microchip Technology – High Performance Microcontrollers with 10-bit A/D

PIC18CXX2
FIGURE 21-9:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
T1OSO/T1CKI
40
41
42
45
46
47
48
TMR0 or
TMR1
Note: Refer to Figure 21-4 for load conditions.
TABLE 21-8: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
40
Tt0H
T0CKI High Pulse Width No Prescaler
0.5TCY + 20
With Prescaler
10
41
Tt0L
T0CKI Low Pulse Width No Prescaler
0.5TCY + 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
High
Time
Synchronous, no prescaler
Synchronous, PIC18CXXX
with prescaler _PIC18LCXXX
0.5TCY + 20
10
25
Asynchronous PIC18CXXX
30
PIC18LCXXX
40
46
Tt1L
T1CKI
Low
Time
Synchronous, no prescaler
Synchronous, PIC18CXXX
with prescaler _PIC18LCXXX
0.5TCY + 20
15
30
Asynchronous PIC18CXXX
30
PIC18LCXXX
40
47
Tt1P
T1CKI Synchronous
input
period
Greater of:
20 nS or TCY + 40
N
Asynchronous
60
Ft1
T1CKI oscillator input frequency range
DC
48
Tcke2tmrI Delay from external T1CKI clock edge to
timer increment
2TOSC
Max Units Conditions
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
50
7TOSC
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
—
 1999-2013 Microchip Technology Inc.
DS39026D-page 249