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STR73XF 数据表(PDF) 30 Page - STMicroelectronics |
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STR73XF 数据表(HTML) 30 Page - STMicroelectronics |
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30 / 53 page  Electrical parameters STR73xF 30/53 3.3.2 Clock and timing characteristics Crystal / Ceramic Resonator Oscillator The STR73xF can operate with a crystal oscillator or resonator clock source. Figure 12 describes a simple model of the internal oscillator driver as well as example of connection for an oscillator or a resonator. Figure 12. Crystal Oscillator and Resonator Notes 1) XTAL2 must not be used to directly drive external circuits. 2) For test or boot purpose, XTAL2 can be used as an high impedance input pin to provide an external clock to the device. XTAL1 should be grounded, and XTAL2 connected to a wave signal generator providing a 0 to VDD signal. Directly driving XTAL2 may results in deteriorated jitter and duty cycle. CL CL Crystal RS Resonator STR73x STR73x STR73x I RF VDD |
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