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TMS320F28335: Time from sending to receiving data is about 60ms

Part Number: TMS320F28335

Hi Team,

Our customer is using SCI of TMS320F28335 with FIFO enabled. He write 7 bytes of data to send to FIFO, which, according to the manual, will be automatically written to the shift register but he found that each of these seven bytes of data are about seven milliseconds apart. So the time from sending to receiving data is about 60ms. Please refer to the waveform below. Is this normal?