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Why can't I send the second packet of serial data?

Latest Updated:06/20/2013

Question:

I am able to transmit the first packet of serial data, but the second packet onwards can not be sent.

Answer:

With the transmit enable bit (TE) that controls initialization of transmission of the second packet onwards set to 1, check that the state of the transmit interrupt enable bit (TIE) hasn't changed from 0 to 1.
The following conditions must be met in order to control initialization of serial transmission of the second packet onwards using the TE bit.

  • 1 can only be written when the TE bit = the RE bit = 0.
  • If either of the TE or RE bits is once set to 1, after that it is only possible to write TE bit = RE bit = 0.

To avoid the above restrictions, don't use the TIE bit to control serial transmission, and set interrupt enable/disable using the interrupt request enable registers (IER) in the interrupt control unit (ICU).

Suitable Products
RX62N, RX621
RX62T
RX610
RX62G
RX63T