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PIC16F876ATI/ML Datasheet(PDF) 184 Page - Microchip Technology |
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PIC16F876ATI/ML Datasheet(HTML) 184 Page - Microchip Technology |
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184 / 234 page  PIC16F87XA DS39582B-page 182 2003 Microchip Technology Inc. FIGURE 17-4: EXTERNAL CLOCK TIMING OSC1 CLKO Q4 Q1 Q2 Q3 Q4 Q1 1 2 3 3 4 4 TABLE 17-3: EXTERNAL CLOCK TIMING REQUIREMENTS Param No. Symbol Characteristic Min Typ† Max Units Conditions FOSC External CLKI Frequency (Note 1) DC — 1 MHz XT and RC Osc mode DC — 20 MHz HS Osc mode DC — 32 kHz LP Osc mode Oscillator Frequency (Note 1) DC — 4 MHz RC Osc mode 0.1 — 4 MHz XT Osc mode 4 5 — — 20 200 MHz kHz HS Osc mode LP Osc mode 1TOSC External CLKI Period (Note 1) 1000 — — ns XT and RC Osc mode 50 — — ns HS Osc mode 5— — µsLP Osc mode Oscillator Period (Note 1) 250 — — ns RC Osc mode 250 — 1 µs XT Osc mode 100 — 250 ns HS Osc mode 50 — 250 ns HS Osc mode 31.25 — — µsLP Osc mode 2TCY Instruction Cycle Time (Note 1) 200 TCY DC ns TCY = 4/FOSC 3TOSL, TOSH External Clock in (OSC1) High or Low Time 100 — — ns XT oscillator 2.5 — — µs LP oscillator 15 — — ns HS oscillator 4TOSR, TOSF External Clock in (OSC1) Rise or Fall Time — — 25 ns XT oscillator — — 50 ns LP oscillator — — 15 ns HS oscillator † 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: Instruction cycle period (TCY) equals four times the input oscillator time base period. All specified values are based on characterization data for that particular oscillator type, under standard operating conditions, with the device executing code. Exceeding these specified limits may result in an unstable oscillator operation and/or higher than expected current consumption. All devices are tested to operate at “min.” values with an external clock applied to the OSC1/CLKI pin. When an external clock input is used, the “max.” cycle time limit is “DC” (no clock) for all devices. |
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