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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST7263BDX датащи(PDF) 112 Page - STMicroelectronics |
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ST7263BDX датащи(HTML) 112 Page - STMicroelectronics |
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112 / 145 page  ST7263BDx ST7263BHx ST7263BKx ST7263BE 112/145 14.5 Clock and timing characteristics Subject to general operating conditions for VDD, fCPU, and TA. 14.5.1 General timings 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. 14.5.2 Control timing characteristics Note: 1. Not tested in production, guaranteed by characterization. Symbol Parameter Conditions Min Typ 1) Max Unit tc(INST) Instruction cycle time fCPU=8MHz 23 12 tCPU 250 375 1500 ns tv(IT) Interrupt reaction time 2) tv(IT) = ∆tc(INST) + 10 tCPU fCPU=8MHz 10 22 tCPU 1.25 2.75 µs Control timings Symbol Parameter Conditions value Unit Min Typ. Max fOSC Oscillator Frequency 24 MHz fCPU Operating Frequency 8 MHz tRL External RESET Input pulse Width 2520 ns tPORL Internal Power Reset Duration 4096 tCPU TDOGL Watchdog or Low Voltage Reset Output Pulse Width 200 300 ns tDOG Watchdog Time-out fcpu = 8MHz 49152 6.144 3145728 393.216 tCPU ms tOXOV Crystal Oscillator Start-up Time 201) 30 401) ms tDDR Power up rise time from VDD = 0 to 4V 1001) ms |
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