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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72311R датащи(PDF) 138 Page - STMicroelectronics |
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ST72311R датащи(HTML) 138 Page - STMicroelectronics |
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138 / 164 page  ST72311R, ST72511R, ST72512R, ST72532R 138/164 12.5 CLOCK AND TIMING CHARACTERISTICS Subject to general operating condition for VDD,fOSC, and TA. 12.5.1 General Timings 12.5.2 External Clock Source Figure 73. Typical Application with an External Clock Source 12.5.3 Crystal and Ceramic Resonator Oscillators 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. 4. CL1 (resp.CL2) is load capacitance on OSC1 (resp. OSC2) pin. 5. RS is the equivalent serial resistance of the crystal or ceramic resonator. Symbol Parameter Conditi ons 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 Condi tions Min Typ Max Unit VOSC1H OSC1 input pin high level voltage see Figure 73 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 ROBP Oscillator bypass exteranl resistor 1 k Ω Symbol Parameter Conditio ns Min Max Unit fOSC Oscillator Frequency 4 16 MHz CL1,CL2 Load capacitance 4) RS=100Ω 5) 12 21 pF tSTART Oscillator start-up time Depends on resonator quality. A typical value is 10ms VOSC1L VOSC1H tr(OSC1) tf(OSC1) tw(OSC1H) tw(OSC1L) 90% 10% |
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