Renesas H8S/2319 series Hardware Manual page 540

Interrupt Operation (Except Block Transfer Mode): There are three interrupt sources in smart
card interface mode: transmit-data-empty interrupt (TXI) requests, transmit/receive-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.
Note: For details of operation in block transfer mode, see section 12.4, SCI Interrupts.
Table 13-8 Smart Card Mode Operating States and Interrupt Sources
Operating State
Transmit Normal
Mode operation
Error
Receive Normal
Mode operation
Error
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. Thus, the number of bytes specified by the SCI is transmitted automatically
even in retransmission following an error. 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 7, 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
Rev. 5.00, 12/03, page 510 of 1088
Flag Enable Bit
TEND TIE
ERS RIE
RDRF RIE
PER, ORER RIE
Interrupt DTC
Source Activation
TXI Possible
ERI Not possible
RXI Possible
ERI Not possible