PIC18F2220 Datasheet, PDF (331/388 Pages) Microchip Technology – 28/40/44-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2220/2320/4220/4320
FIGURE 26-10: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
T1OSO/T1CKI
40
41
42
45
46
47
48
TMR0 or
TMR1
Note: Refer to Figure 26-5 for load conditions.
TABLE 26-11: 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, PIC18FXX20}
with prescaler _PIC18LFXX20
0.5 TCY + 20
10
25
— ns
— ns
— ns
Asynchronous PIC18FXX20
30
— ns
PIC18LFXX20
50
— ns
46 TT1L
T1CKI
Low Time
Synchronous, no prescaler
Synchronous, PIC18FXX20
with prescaler _PIC18LFXX20
0.5 TCY + 5
10
25
— ns
— ns
— ns
Asynchronous PIC18FXX20
30
— ns
PIC18LFXX20
50
— 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.
DS39599C-page 329