hi all,
it might be common knowledge in the community, but it sure was new to me (and
took me some time to debug)…
As you know the STM8 is and 8-bit uC, so reading from or writing to 16b
peripheral registers (SFR) takes place in 2 steps. And I found that the
sequence of access matters for 16b peripheral registers (SFR), and is different
for read and write:
write: byteH+byteL is ok, but byteL+byteH (or word write in C) fails
read: byteL+byteH (and word read in C) is ok, but byteH+byteL fails
I observed this behavior for SDCC v3.4 RC2, and also for Cosmic C-compiler
4.3.7. Hope this note helps avoiding bugs, and saving debugging time.
Have a nice day, :-)
Georg I.
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