Microchip Technology MCU PIC PIC18F87K22-I/PTRSL TQFP-80 MCP PIC18F87K22-I/PTRSL Data Sheet
Product codes
PIC18F87K22-I/PTRSL
PIC18F87K22 FAMILY
DS39960D-page 512
2011 Microchip Technology Inc.
FIGURE 31-12:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 31-15: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
Max
Units
Conditions
40
T
T
0H
T0CKI High Pulse Width
No prescaler
0.5 T
CY
+ 20
—
ns
With prescaler
10
—
ns
41
T
T
0L
T0CKI Low Pulse Width
No prescaler
0.5 T
CY
+ 20
—
ns
With prescaler
10
—
ns
42
T
T
0P
T0CKI Period
No prescaler
T
CY
+ 10
—
ns
With prescaler
Greater of:
20 ns or
(T
CY
+ 40)/N
—
ns
N = prescale
value
(1, 2, 4,..., 256)
value
(1, 2, 4,..., 256)
45
T
T
1H
T1CKI High
Time
Time
Synchronous, no prescaler
0.5 T
CY
+ 20
—
ns
Synchronous, with prescaler
10
—
ns
Asynchronous
30
—
ns
46
T
T
1L
T1CKI Low
Time
Time
Synchronous, no prescaler
0.5 T
CY
+ 5
—
ns
Synchronous, with prescaler
10
—
ns
Asynchronous
30
—
ns
47
T
T
1P
T1CKI Input
Period
Period
Synchronous
Greater of:
20 ns or
(T
CY
+ 40)/N
—
ns
N = prescale
value
(1, 2, 4, 8)
value
(1, 2, 4, 8)
Asynchronous
60
—
ns
F
T
1
T1CKI Oscillator Input Frequency Range
DC
50
kHz
48
T
CKE
2
TMR
I Delay from External T1CKI Clock Edge to
Timer Increment
2 T
OSC
7 T
OSC
—
Note:
Refer to
for load conditions.
46
47
45
48
41
42
40
T0CKI
T1CKI
TMR0 or
TMR1