Part Number: TMS320F28379D
Hello,
I was working on some assembly code, and at the beginning of the code I had these instructions:
MOV AR0, #someAddress
MOV AL, *AR0
where someAddress was 0x8000 in this scenario.
I noticed that the value at 0x8000 wouldn't get stored into AL, and after some investigating I saw that register XAR0 defaulted to 0xFFFFFFFF. So, after running those instructions, I would actually be looking at address 0xFFFF8000, which is of course incorrect. Using this instruction fixed the issue, as expected:
MOVL XAR0, #someAddress
My question is, why does XAR0 default to 0xFFFFFFFF while all of the other XARn registers default to 0? The original instruction was written with the assumption that XAR0 defaulted to 0, and the series of instructions still works for the other auxiliary registers. I've tried looking in the TRM, datasheet, CPU instruction set manual, and errata but I couldn't seem to find any information on this.
Here is an image of what I am referring to. The screenshot was taken before a single line of code was run.
Thank you for your help!
Colin
