QI tried to vary EWAIT register, but without success. In the ADuC841 datasheet
on page 18 EWAIT register is mentioned only once. In the SFR table on page 22
there is no EWAIT register. Location 0x9F marked as "not used". Does really
EWAIT exists and works?
APage 18 of the datasheet is not very clear on access to EWAIT SFR 9FH. See the
SFR maps for ADuC841/2/3 (Fig 27, page 22 ADuC841 datasheet) and for
ADuC845/6/7 (Fig. 7 page 19, ADuC845 datasheet). You can see from the SFR maps
that the EWAIT function is only available on the ADuC845/6/7 series of