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Is it possible for the SCI TXI not to activate CPU and use only the DMA?

Latest Updated:03/23/2009

Question:

On the H8S/2357, is there any way for the SCI TXI interrupt request not to activate the CPU but only the DMA?

Answer:

Set bit 11 (DTA1) and bit 9 (DTA0) of the DMA Band Control Register (DMABCR) to 1. Then the interrupt request does not activate the CPU because interrupt sources will be cleared after the DMA finishes transferring.
Suitable Products
H8S/2398, 2357