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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST7265X датащи(PDF) 135 Page - STMicroelectronics |
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ST7265X датащи(HTML) 135 Page - STMicroelectronics |
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135 / 166 page  ST7265x 135/166 13.5 CLOCK AND TIMING CHARACTERISTICS Subject to general operating conditions for VDD, fOSC, and TA. 13.5.1 General Timings 13.5.2 External Clock Source Figure 77. Typical Application with an External Clock Source Notes: 1. Data based on typical application software. Not tested in production. 2. Time measured between interrupt event and interrupt vector fetch. ∆t c(INST) is the number of tCPU cycles needed to finish the current instruction execution. 3. Data based on design simulation and/or technology characteristics, not tested in production. Symbol Parameter Conditions Min Typ 1) Max Unit tc(INST) Instruction cycle time 2 4 12 tCPU fCPU=8MHz 250 500 1500 ns tv(IT) Interrupt reaction time 2) tv(IT) = ∆tc(INST) + 10 10 22 tCPU fCPU=8MHz 1.25 2.75 µs Symbol Parameter Conditions Min Typ Max Unit VOSC1H OSC1 input pin high level voltage 0.7xVDD VDD V VOSC1L OSC1 input pin low level voltage VSS 0.3xVDD tw(OSC1H) tw(OSC1L) OSC1 high or low time 3) 15 ns tr(OSC1) tf(OSC1) OSC1 rise or fall time 3) 15 IL OSCx Input leakage current VSS≤VIN≤VDD ±1 µA OSC1 OSC2 fOSC EXTERNAL ST72XXX CLOCK SOURCE Not connected internally VOSC1L VOSC1H tr(OSC1) tf(OSC1) tw(OSC1H) tw(OSC1L) IL 90% 10% |
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