T = 1 Protocol Communication

Transmission with T = 1:

  1. Write data into UxTXB.
  2. Program the value of the BWT to Parameter 2 and set the WTCIE bit (UxSCCON[17]).
  3. Take appropriate actions according to the ISO 7816 standard if the WTCIF, GTCIF and/or TXRPTIF bits are set.
  4. Set LAST = 1 (UxTXB[15]) for the last byte of the data.

Reception with T = 1:

  1. Read the UxRXB as the data become available upon a receive interrupt.
  2. Program the value of the CWT to Parameter 3 and set the WTCIE bit (UxSCCON[17]) to ‘1’.
  3. Take appropriate actions according to the ISO 7816 standard if the WTCIF, GTCIF and/or RXRPTIF bits are set.
    Note: For the last character, the user must ensure the guard time is satisfied before transmitting the response. The GTC may be used for this purpose, whereas the WTC interrupt may be disabled or ignored.