Thanks for the reply. But even in the attached document it shows that port-4 is connected to the analog bus. And since the DACs are connected to the analog bus as well, what's the reason for DAC output not being to able to connect to port 4?
Primary limitation is port 4 is not routed out thru DSI, the IDACs in the
CapSense block --
This is so abstruse!
The app note posted in the first reply says that port-4 is connected to the analog bus and so are the IDACs. Where does the DSI come into the picture? And even if it does, what's the use of a port being connected to a BUS when it cannot communicate with other devices on that very BUS?
And also, doesn't the DSI have to do with the digital periferals only? How/Why is it related to the analog periferals for routing analog signals?
If you look at legend lower left and PORT 4 correspondence
you can see the routing capability -
The app note is less than clear, sorry. The IDACs are connected to the bus and to CMOD on P4.x only for doing capsense. When executing capsense functions, these switches are under control of the digital logic, i.e., DSI.
So it appears there's a slightly loose usage of language in the GPIO specification sheet.
Anyway, this solves the problem.