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ST72344K2 датащи(PDF) 209 Page - STMicroelectronics |
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ST72344K2 датащи(HTML) 209 Page - STMicroelectronics |
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209 / 247 page ![]() ST72344xx, ST2345xx Electrical characteristics Doc ID 12321 Rev 6 209/247 13.6 Clock and timing characteristics Subject to general operating conditions for VDD, fOSC, and TA. Figure 96. Typical application with an external clock source Table 95. General timings Symbol Parameter (1) 1. Guaranteed by Design. Not tested in production. Conditions Min Typ (2) 2. Data based on typical application software. Max Unit tc(INST) Instruction cycle time fCPU=8 MHz 23 12 tCPU 250 375 1500 ns tv(IT) Interrupt reaction time (3) tv(IT) = Δtc(INST) + 10 3. Time measured between interrupt event and interrupt vector fetch. Dtc(INST) is the number of tCPU cycles needed to finish the current instruction execution. fCPU=8 MHz 10 22 tCPU 1.25 2.75 µs Table 96. External clock source Symbol Parameter Conditions Min Max Unit VOSC1H OSC1 input pin high level voltage see Figure 96 0.7xVDD VDD V VOSC1L OSC1 input pin low level voltage VSS 0.3xVDD tw(OSC1H) tw(OSC1L) OSC1 high or low time (1) 1. Data based on design simulation and/or technology characteristics, not tested in production. 15 ns tr(OSC1) tf(OSC1) OSC1 rise or fall time (1) 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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