Datasheet

SCI DMA Interface

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Transmit DMA requests are enabled by the setting SET TX DMA and SET TX INT bits. If the SET TX

DMA bit is set, then a TX DMA request is sent to the DMA when data is written to SCITD and TXRDY is

set. In other words, CPU needs to write the first data to start a DMA block transfer. For example, we want

to transmit a data buffer of 20 bytes. DMA will be set up to transmit 19 bytes. The first data for DMA to

transfer is the second byte in the buffer. CPU will have to write the first byte in the buffer to the SCITD

1450

Serial Communication Interface (SCI) Module SPNU562–May 2014

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