AM1806: About uPP

Hello,

Unfortunately, the uPP's internal DMA always transmits data in bursts of 64 bytes. However, DMA read operations have configurable burst size, which may be set per channel using the RDSIZEI and RDSIZEQ bits in the uPP threshold configuration register (UPTCR). A DMA channel waits until the specified number of bytes leaves its internal buffer before performing another burst read from memory.

You can set the byte count to 128 words and the line count 1, but internally it will still transmit in 64 byte bursts. You should be able to verify this by putting a scope on the XDATA pins. 

Regards,
Sahin