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UM0224 Datasheet(PDF) 12 Page - STMicroelectronics |
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UM0224 Datasheet(HTML) 12 Page - STMicroelectronics |
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12 / 34 page  Running the demonstrations STR75x demonstration software 12/34 2.2.2 Clock failure At any demo level, if no clock is present on OSC4M (broken or disconnected Crystal), the following message is displayed on the LCD screen: If the 4 MHz Crystal is not reconnected in 30s, the MCU enters STANDBY mode and the demo will never restart as long as the clock is not present. If the 4 MHz Crystal is reconnected within thirty seconds the MCU continues execution. Note: Connecting the OSC4M after reset may not restart the demo correctly. So you must connect the crystal before starting the demo. Note: The Clock Detector (CKD) feeds the MCU with the FREEOSC used as emergency clock if no clock is detected. No Clock Detected STANDBY in 30s |
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