Datasheet

 1998-2013 Microchip Technology Inc. DS30605D-page 127
PIC16C63A/65B/73B/74B
FIGURE 16-9: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 16-5: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Sym Characteristic Min Typ† Max Units Conditions
40* Tt0H T0CKI High Pulse Width No Prescaler 0.5T
CY + 20 — — ns Must also meet
parameter 42
With Prescaler 10 — — ns
41*
Tt0L T0CKI Low Pulse Width No Prescaler 0.5T
CY + 20 — — ns Must also meet
parameter 42
With Prescaler 10 — — ns
42*
Tt0P T0CKI Period No Prescaler T
CY + 40 — — ns
With Prescaler Greater of:
20 or T
CY + 40
N
— — ns N = prescale value
(2, 4,..., 256)
45*
Tt1H T1CKI High Time Synchronous, Prescaler = 1 0.5T
CY + 20 — — ns Must also meet
parameter 47
Synchronous,
Prescaler = 2,4,8
PIC16CXX 15 — — ns
PIC16LCXX 25 — — ns
Asynchronous PIC16CXX 30 — — ns
PIC16LCXX 50 — — ns
46*
Tt1L T1CKI Low Time Synchronous, Prescaler = 1 0.5T
CY + 20 — — ns Must also meet
parameter 47
Synchronous,
Prescaler = 2,4,8
PIC16CXX 15 — — ns
PIC16LCXX 25 — — ns
Asynchronous PIC16CXX 30 — — ns
PIC16LCXX 50 — — ns
47*
Tt1P T1CKI input
period
Synchronous PIC16CXX Greater of
:
30 or TCY + 40
N
— — ns N = prescale value
(1, 2, 4, 8)
PIC16LCXX Greater of
:
50 or TCY + 40
N
N = prescale value
(1, 2, 4, 8)
Asynchronous PIC16CXX 60 — — ns
PIC16LCXX 100 — — 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 2T
OSC —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.
Note: Refer to Figure 16-4 for load conditions.
46
47
45
48
41
42
40
T0CKI
T1OSO/T1CKI
TMR0 or
TMR1