PIC18F2331_10 Datasheet, PDF (351/392 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D

PIC18F2331/2431/4331/4431
FIGURE 26-9:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
T1OSO/T1CKI
40
41
42
TMR0 or TMR1
45
46
47
48
TABLE 26-9: 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 VDD = 2V
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:
—
20 ns or TCY + 40
N
ns N = prescale value
(1, 2, 4,..., 256)
45
Tt1H
T1CKI High Synchronous, no prescaler
Time
Synchronous, PIC18FXX31
with prescaler _PIC18LFXX31
0.5 TCY + 20
10
25
—
ns
—
ns
—
ns
Asynchronous PIC18FXX31
30
—
ns
PIC18LFXX31
50
—
ns
46
Tt1L
T1CKI
Low Time
Synchronous, no prescaler
Synchronous,
with prescaler
PIC18FXX31
PIC18LFXX31
0.5 TCY + 5
10
25
—
ns
—
ns
—
ns
Asynchronous PIC18FXX31
30
—
ns
PIC18LFXX31
50
—
ns
47
Tt1P
T1CKI Input Synchronous
Period
Greater of:
—
20 ns or TCY + 40
N
ns N = prescale value
(1, 2, 4, 8)
Asynchronous
60
—
ns
Ft1
T1CKI Oscillator Input Frequency Range
DC
50 kHz
48
Tcke2tmrI Delay from External T1CKI Clock Edge to
Timer Increment
2 TOSC
7 TOSC —
 2010 Microchip Technology Inc.
DS39616D-page 351