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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SPC56AP54x датащи(PDF) 18 Page - STMicroelectronics |
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SPC56AP54x датащи(HTML) 18 Page - STMicroelectronics |
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18 / 105 page  Introduction SPC56xP54x, SPC56xP60x 18/105 DocID18340 Rev 6 Triangle wave modulation Programmable modulation depth (±0.25% to ±4% deviation from center frequency) – Programmable modulation frequency dependent on reference frequency Self-clocked mode (SCM) operation 1.5.9 Main oscillator The main oscillator provides these features: Input frequency range 4 MHz to 40 MHz Crystal input mode or Oscillator input mode PLL reference 1.5.10 Internal RC oscillator This device has an RC ladder phase-shift oscillator. The architecture uses constant current charging of a capacitor. The voltage at the capacitor is compared by the stable bandgap reference voltage. The RC Oscillator provides these features: Nominal frequency 16 MHz ±6% variation over voltage and temperature after process trim Clock output of the RC oscillator serves as system clock source in case loss of lock or loss of clock is detected by the PLL RC oscillator is used as the default system clock during startup 1.5.11 Periodic interrupt timer (PIT) The PIT module implements these features: Up to four general purpose interrupt timers 32-bit counter resolution Clocked by system clock frequency Each channel can be used as trigger for a DMA request 1.5.12 System timer module (STM) The STM module implements these features: 32-bit up counter with 8-bit prescaler Four 32-bit compare channels Independent interrupt source for each channel Counter can be stopped in debug mode The STM module is replicated for each processor. |
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