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ST72311R Datasheet(PDF) 27 Page - STMicroelectronics |
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ST72311R Datasheet(HTML) 27 Page - STMicroelectronics |
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27 / 164 page  ST72311R, ST72511R, ST72512R, ST72532R 27/164 5.3 LOW CONSUMPTION OSCILLATOR The fOSC main clock of the ST7 can be generated by two different source types: s an external source s a crystal or ceramic resonator oscillators The associated hardware configuration 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. Crystal/Ceramic Oscillator This oscillator (based on constant current source) is optimized in terms of consumption and has the advantage of producing a very accurate rate on the main clock of the ST7. When using this oscillator, the resonator and the load capacitances have to be connected as shown in Table 4 and have to be mounted as close as possible to the oscillator pins in order to minimize output distortion and start-up stabilization time. This oscillator is not stopped during the RESET phase to avoid losing time in the oscillator start-up phase. These oscillators are not stopped during the RESET phase to avoid losing time in the oscillator start-up phase. Table 4. ST7 Clock Sources Hardware Configur ation OSC1 OSC2 EXTERNAL ST7 SOURCE VDD ROBP OSC1 OSC2 LOAD CAPACITORS ST7 CL2 CL1 |
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