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16F628 Datasheet(PDF) 146 Page - Microchip Technology |
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16F628 Datasheet(HTML) 146 Page - Microchip Technology |
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146 / 168 page  PIC16F627A/628A/648A DS40044A-page 144 Preliminary 2002 Microchip Technology Inc. TABLE 17-9: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS Param No. Sym Characteristic Min Typ† Max Units Conditions 40 Tt0H T0CKI High Pulse Width No Prescaler 0.5T CY + 20* — — ns With Prescaler 10* — — ns 41 Tt0L T0CKI Low Pulse Width No Prescaler 0.5T CY + 20* — — ns With Prescaler 10* — — ns 42 Tt0P T0CKI Period Greater of: T CY + 40* N — — ns N = prescale value (2, 4, ..., 256) 45 Tt1H T1CKI High Time Synchronous, No Prescaler 0.5T CY + 20* — — ns Synchronous, with Prescaler PIC16F62X 15* — — ns PIC16LF62X 25* — — ns Asynchronous PIC16F62X 30* — — ns PIC16LF62X 50* — — ns 46 Tt1L T1CKI Low Time Synchronous, No Prescaler 0.5T CY + 20* — — ns Synchronous, with Prescaler PIC16F62X 15* — — ns PIC16LF62X 25* — — ns Asynchronous PIC16F62X 30* — — ns PIC16LF62X 50* — — ns 47 Tt1P T1CKI input period Synchronous PIC16F62X Greater of: T CY + 40* N — — ns N = prescale value (1, 2, 4, 8) PIC16LF62X Greater of: T CY + 40* N —— — Asynchronous PIC16F62X 60* — — ns PIC16LF62X 100* — — ns Ft1 Timer1 oscillator input frequency range (oscillator enabled by setting bit T1OSCEN) — 32.7(1) —kHz 48 TCKEZt mr1 Delay from external clock edge to timer increment 2Tosc — 7Tosc — * 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 1: This oscillator is intended to work only with 32.768 kHz watch crystals and their manufactured tolerances. Higher value crystal frequencies may not be compatible with this crystal driver. |
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