PIC18F2331 Datasheet, PDF (361/396 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
47
48
TMR0 or
TMR1
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
T0CKI High Pulse Width No Prescaler
0.5 TCY + 20
— ns
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 Synchronous, no prescaler
High 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 Synchronous, no prescaler
Low Time _{Synchronous, PIC18FXX31}
with prescaler _PIC18LFXX31
0.5 TCY + 5
10
25
— ns
— ns
— ns
Asynchronous PIC18FXX31
30
— ns
PIC18LFXX31
TBD
TBD ns
47 Tt1P
T1CKI
Input
Period
Synchronous
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 —
 2003 Microchip Technology Inc.
Preliminary
DS39616B-page 359