PIC18F2331_07 Datasheet, PDF (360/400 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D

PIC18F2331/2431/4331/4431
FIGURE 25-9:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
T1OSO/T1CKI
40
41
42
45
46
TMR0 or TMR1
47
48
Note: Refer to Figure 25-4 for load conditions.
TABLE 25-9: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
Max Units Conditions
40 Tt0H
41 Tt0L
42 Tt0P
T0CKI High Pulse Width
T0CKI Low Pulse Width
T0CKI Period
No prescaler
With prescaler
No prescaler
With prescaler
No prescaler
With prescaler
45 Tt1H
T1CKI High Synchronous, no prescaler
Time
Synchronous, PIC18FXX31
with prescaler _PIC18LFXX31
Asynchronous PIC18FXX31
PIC18LFXX31
46 Tt1L
T1CKI
Low Time
Synchronous, no prescaler
Synchronous,
with prescaler
PIC18FXX31
PIC18LFXX31
Asynchronous PIC18FXX31
PIC18LFXX31
47 Tt1P
T1CKI Input Synchronous
Period
Asynchronous
Ft1
T1CKI Oscillator Input Frequency Range
48 Tcke2tmrI Delay from External T1CKI Clock Edge to
Timer Increment
Legend: TBD = To Be Determined
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
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
TBD
—
—
50
7 TOSC
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
—
DS39616C-page 358
Preliminary
© 2007 Microchip Technology Inc.