2003 Microchip Technology Inc.
DS39582B-page 185
PIC16F87XA
FIGURE 17-8:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 17-6:
TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
Typ
Max
Units
Conditions
40*
TT0H
T0CKI High Pulse Width
No Prescaler
0.5 TCY + 20
ns
Must also meet
parameter 42
With Prescaler
10
ns
41*
TT0L
T0CKI Low Pulse Width
No Prescaler
0.5 TCY + 20
ns
Must also meet
parameter 42
With Prescaler
10
ns
42*
TT0P
T0CKI Period
No Prescaler
TCY + 40
ns
With Prescaler
Greater of:
20 or TCY + 40
N
ns
N = prescale value
(2, 4,..., 256)
45*
TT1H
T1CKI High
Time
Synchronous, Prescaler = 1
0.5 TCY + 20
ns
Must also meet
parameter 47
Synchronous,
Prescaler = 2, 4, 8
Standard(F)15
ns
Extended(LF)25
ns
Asynchronous
Standard(F)30
ns
Extended(LF)50
ns
46*
TT1L
T1CKI Low Time Synchronous, Prescaler = 1
0.5 TCY + 20
ns
Must also meet
parameter 47
Synchronous,
Prescaler = 2, 4, 8
Standard(F)15
ns
Extended(LF)25
ns
Asynchronous
Standard(F)30
ns
Extended(LF)50
ns
47*
TT1P
T1CKI Input
Period
Synchronous
Standard(F)
Greater of:
30 or TCY + 40
N
ns
N = prescale value
(1, 2, 4, 8)
Extended(LF)
Greater of:
50 or TCY + 40
N
N = prescale value
(1, 2, 4, 8)
Asynchronous
Standard(F)60
ns
Extended(LF)
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
2 TOSC
—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.
Note: Refer to Figure 17-3 for load conditions.
46
47
45
48
41
42
40
RA4/T0CKI
RC0/T1OSO/T1CKI
TMR0 or TMR1
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