PIC18F258 MICROCHIP [Microchip Technology], PIC18F258 Datasheet - Page 342

• Manufacturer Part Number: PIC18F258
• Description: High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18FXX8
FIGURE 27-9:
TABLE 27-10: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
DS41159B-page 340
40
41
42
45
46
47
48
Param
No.
Note: Refer to Figure 27-4 for load conditions.
Tt0H
Tt0L
Tt0P
Tt1H
Tt1L
Tt1P
Ft1
Tcke2tmrI Delay from External T1CKI Clock Edge to
Symbol
T1OSO/T1CKI
TMR0 or
TMR1
T0CKI
T0CKI High Pulse Width
T0CKI Low Pulse Width
T0CKI Period
T1CKI
High Time
T1CKI
Low Time
T1CKI
Input Period
T1CKI Oscillator Input Frequency Range
Timer Increment
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
Synchronous, no prescaler
Synchronous,
Asynchronous PIC18FXX8
Synchronous, no prescaler
Synchronous,
with prescaler
Asynchronous PIC18FXX8
Synchronous
Asynchronous
with prescaler
Characteristic
No prescaler
With prescaler
No prescaler
With prescaler
No prescaler
With prescaler
PIC18FXX8
PIC18LFXX8
PIC18LFXX8
PIC18FXX8
PIC18LFXX8
PIC18LFXX8
40
Preliminary
45
42
47
20 ns or T
20 ns or T
0.5 T
0.5 T
0.5 T
0.5 T
Greater of:
Greater of:
T
2 T
CY
41
46
TBD
Min
DC
CY
CY
CY
10
10
10
25
30
50
10
25
30
60
CY
OSC
+ 10
CY
CY
+ 20
+ 20
+ 20
+ 5
N
N
+ 40
+ 40
7 T
TBD
Max
50
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
2002 Microchip Technology Inc.
OSC
48
Units
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
—
N = prescale
value
(1, 2, 4,..., 256)
N = prescale
value
(1, 2, 4, 8)
Conditions