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PIC16F72 Datasheet(PDF) 99 Page - Microchip Technology |
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PIC16F72 Datasheet(HTML) 99 Page - Microchip Technology |
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99 / 136 page  © 2007 Microchip Technology Inc. DS39597C-page 97 PIC16F72 FIGURE 14-8: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS TABLE 14-4: 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 14-3 for load conditions. 46 47 45 48 41 42 40 RA4/T0CKI RC0/T1OSO/T1CKI TMR0 or TMR1 |
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