PIC16F688 Datasheet, PDF (152/174 Pages) Microchip Technology – 14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F688
FIGURE 14-7:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
40
41
42
T1CKI
TMR0 or
TMR1
45
46
47
48
TABLE 14-5: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Sym
Characteristic
Min
Typ† Max Units Conditions
40* Tt0H
T0CKI High Pulse Width
No Prescaler 0.5 TCY + 20 — — ns
With Prescaler
10
— — ns
41* Tt0L
T0CKI Low Pulse Width
No Prescaler 0.5 TCY + 20 — — ns
With Prescaler
10
— — ns
42* Tt0P
T0CKI Period
Greater of: — — ns N = prescale
20 or TCY + 40
value (2, 4,
N
..., 256)
45* Tt1H
T1CKI High Synchronous, No Prescaler 0.5 TCY + 20 — — ns
Time
Synchronous,
15
— — ns
with Prescaler
Asynchronous
30
— — ns
46* Tt1L
T1CKI Low Synchronous, No Prescaler 0.5 TCY + 20 — — ns
Time
Synchronous,
15
— — ns
with Prescaler
Asynchronous
30
— — ns
47* Tt1P
T1CKI Input Synchronous
Period
Greater of: — — ns N = prescale
30 or TCY + 40
value (1, 2, 4,
N
8)
Asynchronous
60
— — 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
2 TOSC*
— 7 TOSC* —
* 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.
DS41203B-page 150
Preliminary
 2004 Microchip Technology Inc.