PIC16C63A/65B/73B/74B
FIGURE 16-9:
T0CKI
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
41
40
42
T1OSO/T1CKI
46
45
47
48
TMR0 or
TMR1
Note: Refer to Figure 16-4 for load conditions.
TABLE 16-5: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Sym
Characteristic
T0CKI High Pulse Width
Min
Typ† Max Units
Conditions
40*
Tt0H
No Prescaler
With Prescaler
No Prescaler
With Prescaler
No Prescaler
0.5TCY + 20
10
—
—
—
—
—
—
—
—
—
—
—
—
ns Must also meet
parameter 42
ns
41*
42*
Tt0L
Tt0P
T0CKI Low Pulse Width
T0CKI Period
0.5TCY + 20
10
ns Must also meet
parameter 42
ns
TCY + 40
ns
With Prescaler Greater of:
20 or TCY + 40
ns N = prescale value
(2, 4,..., 256)
N
45*
46*
47*
Tt1H
Tt1L
Tt1P
T1CKI High Time Synchronous, Prescaler = 1
0.5TCY + 20
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
ns Must also meet
parameter 47
Synchronous,
Prescaler = 2,4,8
PIC16CXX
PIC16LCXX
PIC16CXX
PIC16LCXX
15
ns
25
ns
Asynchronous
30
ns
50
ns
T1CKI Low Time Synchronous, Prescaler = 1
0.5TCY + 20
ns Must also meet
parameter 47
Synchronous,
Prescaler = 2,4,8
PIC16CXX
PIC16LCXX
PIC16CXX
PIC16LCXX
PIC16CXX
15
25
30
50
ns
ns
ns
ns
Asynchronous
Synchronous
T1CKI input
period
Greater of:
30 or TCY + 40
N
ns N = prescale value
(1, 2, 4, 8)
PIC16LCXX
Greater of:
50 or TCY + 40
N
N = prescale value
(1, 2, 4, 8)
Asynchronous
PIC16CXX
60
100
DC
—
—
—
—
—
ns
ns
PIC16LCXX
Ft1
Timer1 oscillator input frequency range
200 kHz
(oscillator enabled by setting bit T1OSCEN)
48
TCKEZtmr1 Delay from external clock edge to timer increment
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.
2TOSC
—
7TOSC
—
*
†
2000 Microchip Technology Inc.
DS30605C-page 127
MICROCHIP [ MICROCHIP ]
