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PIC16C925-S/CL 数据表(PDF) 149 Page - Microchip Technology |
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PIC16C925-S/CL 数据表(HTML) 149 Page - Microchip Technology |
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149 / 182 page  2001 Microchip Technology Inc. Preliminary DS39544A-page 147 PIC16C925/926 15.4 Timing Diagrams and Specifications FIGURE 15-5: EXTERNAL CLOCK TIMING OSC1 CLKOUT Q4 Q1 Q2 Q3 Q4 Q1 1 2 3 3 4 4 TABLE 15-3: EXTERNAL CLOCK TIMING REQUIREMENTS Parameter No. Sym Characteristic Min Typ† Max Units Conditions FOSC External CLKIN Frequency (Note 1) DC — 4 MHz XT and RC osc mode DC — 20 MHz HS osc mode DC — 200 kHz LP osc mode Oscillator Frequency (Note 1) DC — 4 MHz RC osc mode 0.1 — 4MHz XT osc mode 4 — 20 MHz HS osc mode 5 — 200 kHz LP osc mode 1TOSC External CLKIN Period (Note 1) 250 —— ns XT and RC osc mode 125 —— ns HS osc mode 5 —— µs LP osc mode Oscillator Period (Note 1) 250 —— ns RC osc mode 250 — 10,000 ns XT osc mode 125 — 250 ns HS osc mode 5 —— µs LP osc mode 2TCY Instruction Cycle Time (Note 1) 500 — DC ns TCY = 4/FOSC 3 TosL, TosH External Clock in (OSC1) High or Low Time 50 —— ns XT oscillator 2.5 —— µs LP oscillator 10 —— 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 5 V, 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/CLKIN pin. When an external clock input is used, the “Max.” cycle time limit is “DC” (no clock) for all devices. |
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