PIC18FXX20 Datasheet, PDF (329/366 Pages) Microchip Technology – 64/80-Pin High Performance 1 Mbit Enhanced FLASH Microcontrollers with A/D

PIC18FXX20
FIGURE 26-13: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
T1OSO/T1CKI
40
41
42
45
46
47
48
TMR0 or
TMR1
Note: Refer to Figure 26-6 for load conditions.
TABLE 26-12: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param.
No.
Symbol
Characteristic
40
Tt0H
T0CKI High Pulse Width No Prescaler
With Prescaler
41
Tt0L
T0CKI Low Pulse Width No Prescaler
With Prescaler
42
Tt0P
T0CKI Period
No Prescaler
With Prescaler
45
Tt1H
T1CKI
Synchronous, no prescaler
High Time _{Synchronous, PIC18FXX20}
with prescaler _PIC18LFXX20
Asynchronous PIC18FXX20
PIC18LFXX20
46
Tt1L
T1CKI Low Synchronous, no prescaler
Time
Synchronous, PIC18FXX20
with prescaler _PIC18LFXX20
Asynchronous PIC18FXX20
PIC18LFXX20
47
Tt1P
T1CKI
Synchronous
Input
Period
Asynchronous
Ft1
T1CKI Oscillator Input Frequency Range
48
Tcke2tmrI Delay from External T1CKI Clock Edge to
Timer Increment
Min
0.5 TCY + 20
10
0.5 TCY + 20
10
TCY + 10
Greater of:
20 nS or TCY + 40
N
0.5 TCY + 20
10
25
30
50
0.5 TCY + 5
10
25
30
TBD
Greater of:
20 nS or TCY + 40
N
60
DC
2 TOSC
Max Units Conditions
—
ns
—
ns
—
ns
—
ns
—
ns
—
ns N = prescale
value
(1, 2, 4,..., 256)
—
ns
—
ns
—
ns
—
ns
—
ns
—
ns
—
ns
—
ns
—
ns
TBD ns
—
ns N = prescale
value
(1, 2, 4, 8)
—
ns
50 kHz
7 TOSC —
 2003 Microchip Technology Inc.
Advance Information
DS39609A-page 327