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TL16C550D: THRE bit and TEMT bit

Part Number: TL16C550D

Hi all

Would you mind if we ask TL16C550D?

Our customer would like to judge whether Transmitter FIFO is empty or not for next transmit.
In this case, which is better THRE bit or TEMT bit?

In relation to <Question1>, the datasheet shows "Bit 1: When set, this bit enables the THRE interrupt. "
So, in order to transmit data as fast as possible, it seems that they had better use THRE interrupt.
Is our recognition correct?

Kind regards,

Hirotaka Matsumoto