PIC18F4539 Datasheet, PDF (275/322 Pages) Microchip Technology – Enhanced FLASH Microcontrollers with Single Phase Induction Motor Control Kernel

PIC18FXX39
FIGURE 23-9:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
T13CKI
40
41
42
45
46
47
48
TMR0 or
TMR1
Note: Refer to Figure 23-4 for load conditions.
TABLE 23-8: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
Max Units Conditions
40
Tt0H
T0CKI High Pulse Width
No Prescaler
0.5TCY + 20
— ns
With Prescaler
10
—
ns
41
Tt0L
T0CKI Low Pulse Width
No Prescaler
0.5TCY + 20
— ns
With Prescaler
10
—
ns
42
Tt0P
T0CKI Period
No Prescaler
TCY + 10
— ns
With Prescaler
Greater of:
—
20 nS or TCY + 40
N
ns N = prescale
value
(1, 2, 4,..., 256)
45
Tt1H
T13CKI High Synchronous, no prescaler
0.5TCY + 20
Time
Synchronous, PIC18FXXXX
10
with prescaler _PIC18LFXXXX
25
— ns
—
ns
—
ns
Asynchronous PIC18FXXXX
30
—
ns
PIC18LFXXXX
50
—
ns
46
Tt1L
T13CKI Low
Time
Synchronous, no prescaler
Synchronous,
with prescaler
PIC18FXXXX
PIC18LFXXXX
0.5TCY + 5
10
25
—
ns
—
ns
—
ns
Asynchronous PIC18FXXXX
30
—
ns
PIC18LFXXXX
50
—
ns
47
Tt1P
T13CKI input Synchronous
period
Greater of:
—
20 nS or TCY + 40
N
ns N = prescale
value
(1, 2, 4, 8)
Asynchronous
60
—
ns
Ft1
T13CKI oscillator input frequency range
DC
50 kHz
48
Tcke2tmrI Delay from external T13CKI clock edge to timer
increment
2 TOSC
7 TOSC —
 2002 Microchip Technology Inc.
Preliminary
DS30485A-page 273