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PIC16F87X Datasheet, PDF (167/218 Pages) Microchip Technology – 28/40-pin 8-Bit CMOS FLASH Microcontrollers | |||
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PIC16F87X
FIGURE 15-10: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
RA4/T0CKI
40
41
42
RC0/T1OSO/T1CKI
45
46
47
48
TMR0 or
TMR1
Note: Refer to Figure 15-5 for load conditions.
TABLE 15-4: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
Typâ Max Units
Conditions
40*
Tt0H T0CKI High Pulse Width
No Prescaler 0.5TCY + 20 â â ns Must also meet
With Prescaler
10
â â ns parameter 42
41*
Tt0L T0CKI Low Pulse Width
No Prescaler 0.5TCY + 20 â â ns Must also meet
With Prescaler
10
â â ns parameter 42
42*
Tt0P T0CKI Period
No Prescaler
TCY + 40
â â ns
With Prescaler Greater of: â â ns N = prescale value
20 or TCY + 40
(2, 4,..., 256)
N
45*
Tt1H T1CKI High Time Synchronous, Prescaler = 1
0.5TCY + 20 â â ns Must also meet
Synchronous, Standard(F)
15
â â ns parameter 47
Prescaler = 2,4,8 Extended(LF)
25
â â ns
Asynchronous Standard(F)
30
â â ns
Extended(LF)
50
â â ns
46*
Tt1L T1CKI Low Time Synchronous, Prescaler = 1
0.5TCY + 20 â â ns Must also meet
Synchronous, Standard(F)
15
â â ns parameter 47
Prescaler = 2,4,8 Extended(LF)
25
â â ns
Asynchronous Standard(F)
30
â â ns
Extended(LF)
50
â â ns
47*
Tt1P T1CKI input
Synchronous Standard(F)
Greater of: â â ns N = prescale value
period
30 OR TCY + 40
(1, 2, 4, 8)
N
Extended(LF) Greater of:
N = prescale value
50 OR TCY + 40
(1, 2, 4, 8)
N
Asynchronous Standard(F)
60
â â ns
Extended(LF)
100
â â ns
Ft1 Timer1 oscillator input frequency range
DC
â 200 kHz
(oscillator enabled by setting bit T1OSCEN)
48 TCKEZtmr1 Delay from external clock edge to timer increment
2TOSC
â 7TOSC â
* These parameters are characterized but not tested.
â Data in "Typ" column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are
not tested.
 2001 Microchip Technology Inc.
DS30292C-page 165
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