PIC16C7X Datasheet, PDF (229/288 Pages) Microchip Technology – 8-Bit CMOS Microcontrollers with A/D Converter

PIC16C7X
Applicable Devices 72 73 73A 74 74A 76 77
FIGURE 20-6: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
RA4/T0CKI
40
41
42
RC0/T1OSO/T1CKI
45
46
47
48
TMR0 or
TMR1
Note: Refer to Figure 20-1 for load conditions.
TABLE 20-5: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Sym Characteristic
Min
Typ† Max Units Conditions
40*
Tt0H T0CKI High Pulse Width
No Prescaler
0.5TCY + 20
— — ns Must also meet
With Prescaler
10
— — ns ^{parameter 42}
41*
Tt0L T0CKI Low Pulse Width
No Prescaler
0.5TCY + 20
— — ns Must also meet
With Prescaler
10
— — ns parameter 42
42*
Tt0P T0CKI Period
No Prescaler
TCY + 40
— — ns
With Prescaler Greater of:
— — ns N = prescale value
20 or TCY + 40
(2, 4, ..., 256)
N
45*
Tt1H T1CKI High Time Synchronous, Prescaler = 1
0.5TCY + 20
— — ns Must also meet
Synchronous, PIC16C7X
15
— — ns parameter 47
Prescaler =
2,4,8
PIC16LC7X
25
— — ns
Asynchronous PIC16C7X
30
— — ns
PIC16LC7X
50
— — ns
46*
Tt1L T1CKI Low Time Synchronous, Prescaler = 1
0.5TCY + 20
— — ns Must also meet
Synchronous, PIC16C7X
15
— — ns parameter 47
Prescaler =
2,4,8
PIC16LC7X
25
— — ns
Asynchronous PIC16C7X
30
— — ns
PIC16LC7X
50
— — ns
47*
Tt1P T1CKI input period Synchronous PIC16C7X
Greater of:
— — ns N = prescale value
30 OR TCY + 40
(1, 2, 4, 8)
N
PIC16LC7X Greater of:
N = prescale value
50 OR TCY + 40
(1, 2, 4, 8)
N
Asynchronous PIC16C7X
60
— — ns
PIC16LC7X
100
— — ns
Ft1 Timer1 oscillator input frequency range
DC
— 200 kHz
(oscillator enabled by setting bit T1OSCEN)
48 TCKEZtmr1 Delay from external clock edge to timer increment
2Tosc
— 7Tosc —
* 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.
© 1997 Microchip Technology Inc.
DS30390E-page 229