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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST723217 데이터시트(PDF) 146 Page - STMicroelectronics |
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ST723217 데이터시트(HTML) 146 Page - STMicroelectronics |
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146 / 185 page  ST72321 146/185 12.5 CLOCK AND TIMING CHARACTERISTICS Subject to general operating conditions for VDD, fCPU, and TA. 12.5.1 General Timings 12.5.2 External Clock Source Figure 75. Typical Application with an External Clock Source Notes: 1. Data based on typical application software. 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 3 12 tCPU fCPU=8MHz 250 375 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 see Figure 75 VDD-1 VDD V VOSC1L OSC1 input pin low level voltage VSS VSS+1 tw(OSC1H) tw(OSC1L) OSC1 high or low time 3) 5 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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