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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72334J2T3 датащи(PDF) 30 Page - STMicroelectronics |
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ST72334J2T3 датащи(HTML) 30 Page - STMicroelectronics |
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30 / 125 page  ST72334J/N, ST72314J/N, ST72124J 30/125 MULTI-OSCILLATOR (MO) The main clock of the ST7 can be generated by 7 different sources coming from the multi-oscillator block: s an external source s 4 crystal or ceramic resonator oscillators s 1 external RC oscillator s 1 internal high frequency RC oscillator Each oscillator is optimized for a given frequency range in terms of consumption and is selectable through the OPTION BYTE. External Clock Source The default OPTION BYTE value selects the Ex- ternal Clock in the MO block. In this mode, a clock signal (square, sinus or triangle) with ~50% duty cycle has to drive the OSC1 pin while the OSC2 pin is tied to ground (see Figure 19). Figure 19. MO External Clock Crystal/Ceramic Oscillators This family of oscillators has the advantage of pro- ducing a high accuracy on the main clock of the ST7. The selection within a list of 4 oscillators with different frequency ranges has to be done by OP- TION BYTE in order to reduce the consumption. In this mode of the MO block, the resonator and the load capacitances have to be connected as shown in Figure 20 and have to be mounted 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, when selected via the OPTION BYTE, are not stopped during the RESET phase to avoid losing time in the oscillator start-up phase. Figure 20. MO Crystal/Ceramic Resonator OSC1 OSC2 EXTERNAL ST7 SOURCE OSC1 OSC2 LOAD CAPACITANCES ST7 CL1 CL0 |
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