2000 Microchip Technology Inc.
DS30605C-page 127
PIC16C63A/65B/73B/74B
FIGURE 16-9:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 16-5:
TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Sym
Characteristic
Min
Typ† Max Units
Conditions
40*
Tt0H
T0CKI High Pulse Width
No Prescaler
0.5T
CY
+ 20
—
—
ns
Must also meet
parameter 42
With Prescaler
10
—
—
ns
41*
Tt0L
T0CKI Low Pulse Width
No Prescaler
0.5T
CY
+ 20
—
—
ns
Must also meet
parameter 42
With Prescaler
10
—
—
ns
42*
Tt0P
T0CKI Period
No Prescaler
T
CY
+ 40
—
—
ns
With Prescaler Greater of:
20 or T
CY
+ 40
N
—
—
ns
N = prescale value
(2, 4,..., 256)
45*
Tt1H
T1CKI High Time Synchronous, Prescaler = 1
0.5T
CY
+ 20
—
—
ns
Must also meet
parameter 47
Synchronous,
Prescaler = 2,4,8
PIC16CXX
15
—
—
ns
PIC16LCXX
25
—
—
ns
Asynchronous
PIC16CXX
30
—
—
ns
PIC16LCXX
50
—
—
ns
46*
Tt1L
T1CKI Low Time
Synchronous, Prescaler = 1
0.5T
CY
+ 20
—
—
ns
Must also meet
parameter 47
Synchronous,
Prescaler = 2,4,8
PIC16CXX
15
—
—
ns
PIC16LCXX
25
—
—
ns
Asynchronous
PIC16CXX
30
—
—
ns
PIC16LCXX
50
—
—
ns
47*
Tt1P
T1CKI input
period
Synchronous
PIC16CXX
Greater of:
30 or T
CY
+ 40
N
—
—
ns
N = prescale value
(1, 2, 4, 8)
PIC16LCXX
Greater of:
50 or T
CY
+ 40
N
N = prescale value
(1, 2, 4, 8)
Asynchronous
PIC16CXX
60
—
—
ns
PIC16LCXX
100
—
—
ns
Ft1
Timer1 oscillator input frequency range
(oscillator enabled by setting bit T1OSCEN)
DC
— 200
kHz
48
TCKEZtmr1 Delay from external clock edge to timer increment
2T
OSC
—
7T
OSC
—
* These parameters are characterized but not tested.
† Data in “Typ” column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are not tested.
Note:
Refer to Figure 16-4 for load conditions.
46
47
45
48
41
42
40
T0CKI
T1OSO/T1CKI
TMR0 or
TMR1
Summary of Contents for PIC16C63A
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