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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ST72F321BAR6TCRE Scheda tecnica(PDF) 46 Page - STMicroelectronics |
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ST72F321BAR6TCRE Scheda tecnica(HTML) 46 Page - STMicroelectronics |
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46 / 247 page  Supply, reset and clock management ST72321Bxxx-Auto 46/247 multi-oscillator, the resonator and the load capacitors have to be placed as close as possible to the oscillator pins in order to minimize output distortion and start-up stabilization time. The loading capacitance values must be adjusted according to the selected oscillator. These oscillators are not stopped during the RESET phase to avoid losing time in the oscillator start-up phase. Internal RC oscillator This oscillator allows a low cost solution for the main clock of the ST7 using only an internal resistor and capacitor. Internal RC oscillator mode has the drawback of a lower frequency accuracy and should not be used in applications that require accurate timing. In this mode, the two oscillator pins have to be tied to ground. Table 9. ST7 clock sources 6.5 Reset sequence manager (RSM) 6.5.1 Introduction The reset sequence manager includes three RESET sources as shown in Figure 11: ● External RESET source pulse ● Internal LVD RESET (low voltage detection) ● Internal WATCHDOG RESET These sources act on the RESET pin and it is always kept low during the delay phase. Hardware configuration OSC1 OSC2 EXTERNAL ST7 SOURCE OSC1 OSC2 LOAD CAPACITORS ST7 CL2 CL1 OSC1 OSC2 ST7 |
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