During the network acceptance test, it was found that OSN 3500 could work normally when connected to an external clock source, and entered the hold state when disconnected from the external clock source. However, the hold state could not last for 24 hours. Which of the following are the possible reasons?

During the network acceptance test, it was found that OSN 3500 could work normally when connected to an external clock source, and entered the hold state when disconnected from the external clock source. However, the hold state could not last for 24 hours. Which of the following are the possible reasons?
A . The time of accessing the external high-precision clock source is too short
B . The clock SSM function is not enabled
C . Clock level setting error 70200
D . The clock crystal oscillator fails and the board needs to be replaced

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Answer: A