SLAZ367Q October 2012 – May 2021 MSP430FG4617
DMA Module
Functional
Read-modify-write instructions may corrupt DMA address registers
When a 16-bit wide read-modify-write instruction (such as add.w and sub.w) is directly used on a DMA address register (DMAxSA or DMAxDA), the register contents will get corrupted.
1. Do not use 16-bit wide read-modify-write instructions on DMA address registers. Instead, in case address calculations are necessary, do the calculations first, and then assign the result to the DMA address registers.
OR
2. Use 20-bit wide read-modify-write instructions (such as addx.a, subx.a) on the DMA address registers if needed.