PIC18F2450 MICROCHIP [Microchip Technology], PIC18F2450 Datasheet - Page 289

• Manufacturer Part Number: PIC18F2450
• Description: 28/40/44-Pin, High-Performance, 12 MIPS, Enhanced Flash, USB Microcontrollers with nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 21-9:
TABLE 21-11: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
© 2006 Microchip Technology Inc.
Param
40
41
42
45
46
47
48
No.
Note:
Tt0H
Tt0L
Tt0P
Tt1H
Tt1L
Tt1P
Ft1
Tcke2tmrI Delay from External T1CKI Clock Edge to Timer
Symbol
T1OSO/T1CKI
TMR0 or
Refer to Figure 21-4 for load conditions.
T0CKI
TMR1
T0CKI High Pulse Width
T0CKI Low Pulse Width
T0CKI Period
T1CKI High
Time
T1CKI Low
Time
T1CKI Input
Period
T1CKI Oscillator Input Frequency Range
Increment
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
Synchronous, no prescaler
Synchronous,
with prescaler
Asynchronous
Synchronous, no prescaler
Synchronous,
with prescaler
Asynchronous
Synchronous
Asynchronous
Characteristic
Advance Information
40
45
No prescaler
With prescaler
No prescaler
With prescaler
No prescaler
With prescaler
PIC18FXXXX
PIC18LFXXXX
PIC18FXXXX
PIC18LFXXXX
PIC18FXXXX
PIC18LFXXXX
PIC18FXXXX
PIC18LFXXXX
42
47
0.5 T
0.5 T
(T
0.5 T
(T
0.5 T
Greater of:
Greater of:
41
46
T
CY
20 ns or
20 ns or
CY
2 T
PIC18F2450/4450
CY
Min
DC
CY
10
CY
10
+ 40)/N
CY
10
25
30
50
10
25
30
50
60
+ 40)/N
CY
OSC
+ 10
+ 20
+ 20
+ 20
+ 5
7 T
Max
50
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
OSC
48
Units
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
—
DS39760A-page 287
N = prescale
value
(1, 2, 4,..., 256)
V
V
V
V
N = prescale
value (1, 2, 4, 8)
DD
DD
DD
DD
Conditions
= 2.0V
= 2.0V
= 2.0V
= 2.0V