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ST7DALI Arkusz danych(PDF) 26 Page - STMicroelectronics |
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ST7DALI Arkusz danych(HTML) 26 Page - STMicroelectronics |
26 / 141 page ST7DALI 26/141 7.4 MULTI-OSCILLATOR (MO) The main clock of the ST7 can be generated by four different source types coming from the multi- oscillator block (1 to 16MHz or 32kHz): ■ an external source ■ 5 crystal or ceramic resonator oscillators ■ an 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. The associated hardware configurations are shown in Table 4. Refer to the electrical characteristics section for more details. External Clock Source In this external clock 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. Note: when the Multi-Oscillator is not used, PB4 is selected by default as external clock. Crystal/Ceramic Oscillators This family of oscillators has the advantage of pro- ducing a very accurate rate on the main clock of the ST7. The selection within a list of 4 oscillators with different frequency ranges has to be done by option byte in order to reduce consumption (refer to section 15.1 on page 130 for more details on the frequency ranges). In this mode of the multi-oscil- lator, 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 capaci- tance 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 In this mode, the tunable 1%RC oscillator is used as main clock source. The two oscillator pins have to be tied to ground. Table 4. ST7 Clock Sources Hardware Configuration OSC1 OSC2 EXTERNAL ST7 SOURCE OSC1 OSC2 LOAD CAPACITORS ST7 CL2 CL1 OSC1 OSC2 ST7 1 |
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