Datasheet

© 2008 Microchip Technology Inc. DS41249E-page 155
PIC16F785/HV785
FIGURE 19-7: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 19-5: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Sym Characteristic Min Typ† Max Units Conditions
40* T
T0H T0CKI High Pulse Width No Prescaler 0.5 TCY + 20 — — ns
With Prescaler 10 — — ns
41* T
T0L T0CKI Low Pulse Width No Prescaler 0.5 TCY + 20 — — ns
With Prescaler 10 — — ns
42* T
T0P T0CKI Period Greater of:
20 or T
CY + 40
N
— — ns N = prescale
value (2, 4, ...,
256)
45* T
T1H T1CKI High
Time
Synchronous, No Prescaler 0.5 TCY + 20 — — ns
Synchronous,
with Prescaler
15 — — ns
Asynchronous 30 — — ns
46* T
T1L T1CKI Low Time Synchronous, No Prescaler 0.5 TCY + 20 — — ns
Synchronous,
with Prescaler
15 — — ns
Asynchronous 30 — — ns
47* T
T1P T1CKI Input
Period
Synchronous Greater of:
30 or T
CY + 40
N
— — ns N = prescale
value (1, 2, 4,
8)
Asynchronous 60 — — ns
48 F
T1 Timer1 oscillator input frequency range
(oscillator enabled by setting bit T1OSCEN)
DC — 200* kHz
49 TCKEZ
TMR1 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 5.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are
not tested.
T0CKI
T1CKI
40
41
42
45
46
47
49
TMR0 or
TMR1