SH7263 Datasheet, PDF (938/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 18 Serial Sound Interface (SSI)
18.5 Usage Notes
18.5.1 Limitations from Overflow during Receive DMA Operation
If an overflow occurs while the receive DMA is in operation, the module should be restarted. The
receive buffer in the SSI consists of 32-bit registers that share the L and R channels. Therefore,
data to be received at the L channel may sometimes be received at the R channel if an overflow
occurs, for example, under the following condition: the control register (SSICR) has a 32-bit
setting for both data word length (DWL2 to DWL0) and system word length (SWL2 to SWL).
If an overflow is confirmed with the overflow error interrupt or overflow error status flag (the
OIRQ bit in SSISR), write 0 to the EN bit in SSICR and DMEN bit to disable DMA in the SSI
module, thus stopping the operation. (In this case, the controller setting should also be stopped.)
After this, write 0 to the OIRQ bit to clear the overflow status, set DMA again and restart the
transfer.
Rev. 2.00 Mar. 14, 2008 Page 904 of 1824
REJ09B0290-0200