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PIC16F87 Datasheet(PDF) 180 Page - Microchip Technology |
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PIC16F87 Datasheet(HTML) 180 Page - Microchip Technology |
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180 / 230 page  PIC16F87/88 DS30487D-page 180 2002-2013 Microchip Technology Inc. FIGURE 18-8: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS TABLE 18-6: 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 PIC16F87/88 15 — — ns PIC16LF87/88 25 — — ns Asynchronous PIC16F87/88 30 — — ns PIC16LF87/88 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 PIC16F87/88 15 — — ns PIC16LF87/88 25 — — ns Asynchronous PIC16F87/88 30 — — ns PIC16LF87/88 50 — — ns 47* Tt1P T1CKI Input Period Synchronous PIC16F87/88 Greater of: 30 or TCY + 40 N — — ns N = prescale value (1, 2, 4, 8) PIC16LF87/88 Greater of: 50 or TCY + 40 N N = prescale value (1, 2, 4, 8) Asynchronous PIC16F87/88 60 — — ns PIC16LF87/88 100 — — ns Ft1 Timer1 Oscillator Input Frequency Range (Oscillator enabled by setting bit T1OSCEN) DC — 32.768 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 18-3 for load conditions. 46 47 45 48 41 42 40 RA4/T0CKI RB6/T1OSO/T1CKI TMR0 or TMR1 |
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