Clock Failure; Figure 12. No Hse Clock Detected; Figure 13. Standby Mode Entered - ST STM32303C-EVAL User Manual

Running the demonstration
2.2.2

Clock failure

At any demonstration level, if no clock is present on OSC_IN (broken or disconnected
crystal), the message shown in

Figure 12. No HSE clock detected

If the 8 MHz crystal is not reconnected in the next few seconds, the MCU enters Standby
mode. If the 8 MHz crystal is reconnected within a few seconds, a system reset is
generated.
Note: The clock security system (CSS) feeds the MCU with the HSI OSC used as an emergency
clock if no clock is detected.
When a timeout occurs, the MCU enters Standby mode and the message shown in
Figure 13

Figure 13. Standby mode entered

1. The demonstration does not restart as long as the 8 MHz crystal is not present.
2. Connecting the 8 MHz crystal oscillator after reset may not restart the demonstration correctly. The crystal
oscillator must be connected before starting the demo.
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is displayed on the LCD screen.
Doc ID 023892 Rev 1
Figure 12 is displayed on the LCD screen.
UM1590