Datasheet
© 2007 Microchip Technology Inc. DS40039E-page 99
PIC16F630/676
FIGURE 12-9: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 12-5: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
T0CKI
T1CKI
40
41
42
45
46
47
48
TMR0 or
TMR1
Param
No.
Sym Characteristic Min Typ† Max Units Conditions
40* Tt0H T0CKI High Pulse Width No Prescaler 0.5 T
CY + 20 — — ns
With Prescaler 10 — — ns
41* Tt0L T0CKI Low Pulse Width No Prescaler 0.5 T
CY + 20 — — ns
With Prescaler 10 — — ns
42* Tt0P T0CKI Period Greater of:
20 or T
CY + 40
N
— — ns N = prescale value
(2, 4, ..., 256)
45* Tt1H T1CKI High Time Synchronous, No Prescaler 0.5 T
CY + 20 — — ns
Synchronous,
with Prescaler
15 — — ns
Asynchronous 30 — — ns
46* Tt1L T1CKI Low Time Synchronous, No Prescaler 0.5 T
CY + 20 — — ns
Synchronous,
with Prescaler
15 — — ns
Asynchronous 30 — — ns
47* Tt1P T1CKI Input
Period
Synchronous Greater of:
30 or T
CY + 40
N
— — ns N = prescale value
(1, 2, 4, 8)
Asynchronous 60 — — 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 2 T
OSC*—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.