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Interrupt Operation:

There are three interrupt sources in smart card interface mode: transmit

data empty interrupt (TXI) requests, transfer error interrupt (ERI) requests, and receive data full

interrupt (RXI) requests. The transmit end interrupt (TEI) request is not used in this mode.

When the TEND flag in SSR is set to 1, a TXI interrupt request is generated.

When the RDRF flag in SSR is set to 1, an RXI interrupt request is generated.

When any of flags ORER, PER, and ERS in SSR is set to 1, an ERI interrupt request is generated.

The relationship between the operating states and interrupt sources is shown in table 13.8.

Smart Card Mode Operating States and Interrupt Sources

Operating State

Interrupt Source

DTC Activation

Not possible

Not possible

Data Transfer Operation by DTC:

In smart card mode, as with the normal SCI, transfer can be

carried out using the DTC. In a transmit operation, the TDRE flag is also set to 1 at the same time

as the TEND flag in SSR, and a TXI interrupt is generated. If the TXI request is designated

beforehand as a DTC activation source, the DTC will be activated by the TXI request, and transfer

of the transmit data will be carried out. The TDRE and TEND flags are automatically cleared to 0

when data transfer is performed by the DTC. In the event of an error, the SCI retransmits the same

data automatically. However, the ERS flag is not cleared automatically when an error occurs, and

so the RIE bit should be set to 1 beforehand so that an ERI request will be generated in the event

of an error, and the ERS flag will be cleared.

When performing transfer using the DTC, it is essential to set and enable the DTC before carrying

out SCI setting. For details of the DTC setting procedures, see section 8, Data Transfer Controller

In a receive operation, an RXI interrupt request is generated when the RDRF flag in SSR is set to

1. If the RXI request is designated beforehand as a DTC activation source, the DTC will be

activated by the RXI request, and transfer of the receive data will be carried out. The RDRF flag is

cleared to 0 automatically when data transfer is performed by the DTC. If an error occurs, an error

flag is set but the RDRF flag is not. The DTC is not activated, but instead, an ERI interrupt request

is sent to the CPU. Therefore, the error flag should be cleared.

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