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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST7FOXF1 датащи(PDF) 91 Page - STMicroelectronics |
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ST7FOXF1 датащи(HTML) 91 Page - STMicroelectronics |
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91 / 226 page  ST7FOXF1, ST7FOXK1, ST7FOXK2 On-chip peripherals 91/226 Figure 45. Input capture timing diagram Long range input capture Pulses that last more than 8 µs can be measured with an accuracy of 4 µs if fOSC equals 8 MHz in the following conditions: ● The 12-bit AT4 timer is clocked by the Lite timer (RTC pulse: CK[1:0] = 01 in the ATCSR register) ● The ICS bit in the ATCSR2 register is set so that the LTIC pin is used to trigger the AT4 timer capture. ● The signal to be captured is connected to LTIC pin ● Input Capture registers LTICR, ATICRH and ATICRL are read This configuration allows to cascade the Lite timer and the 12-bit AT4 timer to get a 20-bit Input Capture value. Refer to Figure 46. Figure 46. Long range input capture block diagram COUNTER1 t 01h fCOUNTER xxh 02h 03h 04h 05h 06h 07h 04h ATIC PIN ICF FLAG INTERRUPT 08h 09h 0Ah INTERRUPT ATICR READ 09h LTIC ATIC ICS 1 0 12-bit Input Capture register OFF fcpu fLTIMER 12-bit Upcounter1 12-bit AutoReload register 8-bit Input Capture register 8-bit Timebase Counter1 fOSC/32 LTICR CNTR1 ATICR ATR1 8 LSB bits 12 MSB bits LITE TIMER 12-bit ARTIMER 20 cascaded bits |
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