Datasheet

 1999-2013 Microchip Technology Inc. Preliminary DS41124D-page 137
PIC16C745/765
FIGURE 16-8: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 16-5: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Note: Refer to Figure 16-2 for load conditions.
46
47
45
48
41
42
40
T0CKI
T1OSO/T1CKI
TMR0 or
TMR1
Param
No.
Sym Characteristic Min Typ† Max Units Conditions
40* T
T0H T0CKI High Pulse Width No Prescaler 0.5 TCY + 20 — — ns Must also meet
parameter 42
With Prescaler 10 — — ns
41*
T
T0L T0CKI Low Pulse Width No Prescaler 0.5 TCY + 20 — — ns Must also meet
parameter 42
With Prescaler 10 — — ns
42*
T
T0P T0CKI Period No Prescaler TCY + 40 — — ns N = prescale value
(2, 4,..., 256)
With Prescaler Greater of:
20 or T
CY + 40
N
——ns
45*
T
T1H T1CKI High Time Synchronous, Prescaler = 1 0.5 TCY + 20 — — ns Must also meet
parameter 47
Synchronous,
Prescaler = 2,4,8
15 — — ns
Asynchronous 30 — — ns
46*
T
T1L T1CKI Low Time Synchronous, Prescaler = 1 0.5 TCY + 20 — — ns Must also meet
parameter 47
Synchronous,
Prescaler = 2,4,8
15 — — ns
Asynchronous 30 — — ns
47*
T
T1P T1CKI input period Synchronous Greater of:
30 or TCY + 40
N
— — ns N = prescale value
(1, 2, 4, 8)
Asynchronous 60 — — ns
F
T1 Timer1 oscillator input frequency range
(oscillator enabled by setting bit T1OSCEN)
DC — 200 kHz
48 TCKEZ
TMR1 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.