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PIC16F87XATI/SP Datasheet - Page 185

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FIGURE 17-8:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
RA4/T0CKI
RC0/T1OSO/T1CKI
TMR0 or TMR1
Note: Refer to Figure 17-3 for load conditions.
TABLE 17-6:
TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
Symbol
Characteristic
No.
40*
T
0H
T0CKI High Pulse Width
T
41*
T
0L
T0CKI Low Pulse Width
T
42*
T
0P
T0CKI Period
T
45*
T
1H
T1CKI High
Synchronous, Prescaler = 1
T
Time
Synchronous,
Prescaler = 2, 4, 8
Asynchronous
46*
T
1L
T1CKI Low Time Synchronous, Prescaler = 1
T
Synchronous,
Prescaler = 2, 4, 8
Asynchronous
47*
T
1P
T1CKI Input
Synchronous
T
Period
Asynchronous
F
1
Timer1 Oscillator Input Frequency Range
T
(oscillator enabled by setting bit T1OSCEN)
48
TCKEZ
1 Delay from External Clock Edge to Timer Increment
TMR
*
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.
 2001-2013 Microchip Technology Inc.
PIC16F87XA
41
40
42
46
45
47
Min
Typ†
Max
No Prescaler
0.5 T
+ 20
CY
With Prescaler
10
No Prescaler
0.5 T
+ 20
CY
With Prescaler
10
No Prescaler
T
+ 40
CY
With Prescaler
Greater of:
20 or T
+ 40
CY
N
0.5 T
+ 20
CY
Standard(F)
15
Extended(LF)
25
Standard(F)
30
Extended(LF)
50
0.5 T
+ 20
CY
Standard(F)
15
Extended(LF)
25
Standard(F)
30
Extended(LF)
50
Standard(F)
Greater of:
30 or T
+ 40
CY
N
Extended(LF)
Greater of:
50 or T
+ 40
CY
N
Standard(F)
60
Extended(LF)
100
DC
2 T
7 T
OSC
48
Units
Conditions
ns
Must also meet
parameter 42
ns
ns
Must also meet
parameter 42
ns
ns
ns
N = prescale value
(2, 4,..., 256)
ns
Must also meet
parameter 47
ns
ns
ns
ns
ns
Must also meet
parameter 47
ns
ns
ns
ns
ns
N = prescale value
(1, 2, 4, 8)
N = prescale value
(1, 2, 4, 8)
ns
ns
200
kHz
OSC
DS39582C-page 185

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