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• Clear all transmit interrupt flags in the TX_STATUS register by writing a one to the
bits of the register.
• Enable the transmit interrupts desired by clearing the mask bits in the INT_MASK
register. If more than 4 characters are to be sent, it is suggested that the TDTF
interrupt be used to signify when to write more characters to the transmit FIFO. This
results in the most efficient transfer times to the Smart Card.
• Enable the transmission of the error checking characters (LRC or CRC) by setting
the XMT_CRC_LRC bit in the CTRL register.
NOTE
If the card supports PPS, the software may not be allowed
to send the LRC/CRC information until the PPS exchange
is completed. If so, do not set the XMT_CRC_LRC bit
during the PPS exchange.
• Enable the transmitter by setting the XMT_EN bit in the CTRL register.
• Write the characters to be sent as response (max 4) to the transmit FIFO using the
TX_BUF register.
At this point, the EMV SIM module will transmit the characters in the transmit FIFO. If
more than 4 characters are to be sent, the transmit threshold interrupt will be set when the
threshold number of characters are remaining in the FIFO. The software can then write an
additional number of characters to be sent without interrupting transmission to the Smart
Card.
Once the transmission is complete, the EMV SIM module should be completely
configured for standard operation with the T=1 Smart Card. The software can continue to
service RDTF interrupts for received characters, and TDTF interrupts for transmitted
characters.
Functional Description
K32 L2A Reference Manual, Rev. 2, 01/2020
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NXP Semiconductors
Содержание K32 L2A Series
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