PIC16LC74B-16 Datasheet, PDF (15/41 Pages) Microchip Technology – 8-Bit CMOS Microcontrollers with A/D Converter

PIC16LC74B-16/PTL16
FIGURE 2-7: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
T1OSO/T1CKI
40
41
42
45
46
47
48
TMR0 or
TMR1
Note: Refer to Figure 2-2 for load conditions.
TABLE 2-5: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Sym
Characteristic
Min
Typ† Max Units Conditions
40*
41*
42*
45*
46*
47*
48
*
†
Tt0H
T0CKI High Pulse Width
No Prescaler
0.5TCY + 20
— — ns Must also meet
With Prescaler
10
— — ns ^{parameter 42}
Tt0L
T0CKI Low Pulse Width
No Prescaler
0.5TCY + 20
— — ns Must also meet
With Prescaler
10
— — ns ^{parameter 42}
Tt0P
T0CKI Period
No Prescaler
TCY + 40
— — ns
With Prescaler
Greater of:
20 or TCY + 40
— — ns N = prescale value
(2, 4,..., 256)
N
Tt1H
T1CKI High Time Synchronous, Prescaler = 1
0.5TCY + 20
— — ns Must also meet
Synchronous, Prescaler = 2,4,8
25
— — ns parameter 47
Asynchronous
50
— — ns
Tt1L
T1CKI Low Time Synchronous, Prescaler = 1
0.5TCY + 20
— — ns Must also meet
Synchronous, Prescaler = 2,4,8
25
— — ns ^{parameter 47}
Asynchronous
50
— — ns
Tt1P
T1CKI input period Synchronous
Greater of:
N = prescale value
50 OR TCY + 40
(1, 2, 4, 8)
N
Asynchronous
100
— — ns
Ft1
Timer1 oscillator input frequency range
DC
— 200 kHz
(oscillator enabled by setting bit T1OSCEN)
TCKEZtmr1 Delay from external clock edge to timer increment
2Tosc
— 7Tosc —
These parameters are characterized but not tested.
Data in "Typ" column is at 3V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
© 1999 Microchip Technology Inc.
Preliminary
DS30026A-page 15