Rev. 1.0, 09/02, page 345 of 568
Figure 14.28 shows a flowchart for transmission. The sequence of transmit operations can be
performed automatically by specifying the DTC to be activated with a TXI interrupt source. In a
transmit operation, the TDRE flag is set to 1 at the same time as the TEND flag in SSR is set, and
a TXI interrupt will be generated if the TIE bit in SCR has been set to 1. 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 is transferred by the DTC. In the event of an error, the SCI retransmits the
same data automatically. During this period, the TEND flag remains cleared to 0 and the DTC is
not activated. Therefore, the SCI and DTC will automatically transmit the specified number of
bytes in the event of an error, including retransmission. 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, refer to section 8, Data Transfer
Controller (DTC).
D0 D1 D2 D3 D4 D5 D6 D7 Dp
DE
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp
(DE)
Ds D0 D1 D2 D3 D4
Ds
Transfer
frame n+1
Retransferred frame
nth transfer frame
TDRE
TEND
[6]
FER/ERS
Transfer to TSR from TDR
Transfer to TSR from TDR
Transfer to TSR
from TDR
[7]
[9]
[8]
Figure 14.26 Retransfer Operation in SCI Transmit Mode
Summary of Contents for H8S/2627
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