Interrupts In Smart Card Interface Mode - Renesas RX100 Series User Manual

RX13T Group
23.12.3

Interrupts in Smart Card Interface Mode

Table 23.32 lists interrupt sources in smart card interface mode. A transmit end interrupt (TEI) request cannot be used in
this mode.
Table 23.32 SCI Interrupt Sources
Name Interrupt Source
ERI Receive error or error signal detection
RXI Receive data full
TXI Transmit data empty
Data transmission/reception using the DTC is also possible in smart card interface mode, similar to in the normal SCI
mode. In transmission, when the TEND flag in the SSR register is set to 1, a TXI interrupt request is generated. This TXI
interrupt request activates the DTC allowing transfer of transmit data if the TXI request is specified beforehand as a
source of DTC activation. The TEND flag is automatically set to 0 when the DTC transfers the data.
If an error occurs, the SCI automatically retransmits the same data. During the retransmission, the TEND flag is kept to 0
and the DTC is not activated. Therefore, the SCI and DTC automatically transmit the specified number of bytes,
including retransmission in the case of error occurrence. However, the ERS flag in the SSR register is not automatically
cleared to 0 at error occurrence. Therefore, the ERS flag must be cleared by previously setting the RIE bit in the SCR
register to 1 to enable an ERI interrupt request to be generated at error occurrence.
When transmitting/receiving data using the DTC, be sure to make settings to enable the DTC before making SCI settings.
For DTC settings, refer to section 16, Data Transfer Controller (DTCb) .
In reception, an RXI interrupt request is generated when receive data is set to RDR. This RXI interrupt request activates
the DTC allowing transfer of receive data if the RXI request is specified beforehand as a source of DTC activation. If an
error occurs, the error flag is set. Therefore, the DTC is not activated and an ERI interrupt request is issued to the CPU
instead; the error flag must be cleared.
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
23. Serial Communications Interface (SCIg, SCIh)
Interrupt Flag
ORER, PER, or ERS
—
TEND
DTC Activation
Not possible
Possible
Possible
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