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PIC16C925-S/CL датащи(PDF) 152 Page - Microchip Technology |
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PIC16C925-S/CL датащи(HTML) 152 Page - Microchip Technology |
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152 / 182 page ![]() PIC16C925/926 DS39544A-page 150 Preliminary 2001 Microchip Technology Inc. FIGURE 15-8: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS TABLE 15-6: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS 46 47 45 48 41 42 40 RA4/T0CKI RC0/T1OSO/T1CKI TMR0 or TMR1 Note: Refer to Figure 15-4 for load conditions. Param No. Symbol Characteristic Min Typ† Max Units Conditions 40 Tt0H T0CKI High Pulse Width No Prescaler 0.5TCY + 20 —— ns Must also meet parameter 42 With Prescaler 10 —— ns 41 Tt0L T0CKI Low Pulse Width No Prescaler 0.5TCY + 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 0.5TCY + 20 —— ns Must also meet parameter 47 Synchronous, Prescaler = 2,4,8 PIC16C925/926 15 —— ns PIC16LC925/926 25 —— ns Asynchronous PIC16C925/926 30 —— ns PIC16LC925/926 50 —— ns 46 Tt1L T1CKI Low Time Synchronous, Prescaler = 1 0.5TCY + 20 —— ns Must also meet parameter 47 Synchronous, Prescaler = 2,4,8 PIC16C925/926 15 —— ns PIC16LC925/926 25 —— ns Asynchronous PIC16C925/926 30 —— ns PIC16LC925/926 50 —— ns 47 Tt1P T1CKI Input Period Synchronous PIC16C925/926 Greater of: 30 or TCY + 40 N —— ns N = prescale value (1, 2, 4, 8) PIC16LC925/926 Greater of: 50 or TCY + 40 N N = prescale value (1, 2, 4, 8) Asynchronous PIC16C925/926 60 —— ns PIC16LC925/926 100 —— 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 2Tosc — 7Tosc — † Data in "Typ" column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are not tested. |
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