Datasheet

© 2009 Microchip Technology Inc. DS41341E-page 229
PIC16F72X/PIC16LF72X
FIGURE 23-10: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 23-5: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Operating Temperature -40°C ≤ T
A ≤ +125°C
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)
32.4 32.768 33.1 kHz
49* TCKEZ
TMR1 Delay from External Clock Edge to Timer
Increment
2 TOSC —7 TOSC — Timers in Sync mode
* These parameters are characterized but not tested.
† Data in “Typ” column is at 3.0V, 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