I'm new to assembly language programming of the MSP430 (not assembly in
general, but new to the 430 in this mode.)
I'm trying to create an instruction to write a byte of data to RAM, where
the address is in a register.
This is an example:
mov.b #123, R8 ; this would be a value
mov.b #0x251, R9 ; this would be an address in RAM
Now the idea is I want to put the 123 in R8 into a byte at 0x0251 which is
pointed to by R9.
I try this:
mov.b R8, @R9
but it will not assemble.
As I look through the Chris Nagy book (embedded systems design using the TI
MSP430 series) I cannot find any usage of this sort of instruction; all of
the examples I can see either read from RAM this way (mov @R9, R8) or write
to an absolute location (mov R8, &somewhere-absolute), but these do not
solve my problem.
I had previously been working in C and had no difficulty writing to RAM
using a simple assignment operator and pointer arrangement.
What am I doing wrong?
Very tks,
Dave
[email protected]
