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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) 31 Page - STMicroelectronics |
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ST72334J2T3 датащи(HTML) 31 Page - STMicroelectronics |
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31 / 125 page  ST72334J/N, ST72314J/N, ST72124J 31/125 MULTI-OSCILLATOR (Cont’d) External RC Oscillator This oscillator allows a low cost solution for the main clock of the ST7 using only an external resis- tor and an external capacitor (see Figure 21). The selection of the external RC oscillator has to be done by OPTION BYTE. The frequency of the external RC oscillator (in the range of some MHz.) is fixed by the resistor and the capacitor values: The previous formula shows that in this MO mode, the accuracy of the clock is directly linked to the accuracy of the discrete components. Figure 21. MO External RC Internal RC Oscillator The Internal RC oscillator mode is based on the same principle as the External RC oscillator in- cluding the resistance and the capacitance of the device. This mode is the most cost effective one with the drawback of a lower frequency accuracy. Its frequency is in the range of several MHz. In this mode, the two oscillator pins have to be tied to ground as shown in Figure 22. The selection of the internal RC oscillator has to be done by OPTION BYTE. Figure 22. MO Internal RC Note: 1) This formula provides an approximation of the frequency with typical REX and CEX values at VDD=5V. It is given only as design guidelines. fOSC ~ 4 REX .CEX 1) OSC1 OSC2 ST7 CEX REX OSC1 OSC2 ST7 |
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