Hello, I am a bit confused about this schematic;
In the first part, you can see the signal called ACD-DROP which should be later processed by a microcontroller, but in the microcontroller part of the schematic, the same signal is considered as an output. An explanation, please.

 

why do you say the micro is an output ?
in general the diamond symbol is just a picture , you need to look at the proc and see if thats an input or not
also check what type of logic the 4093 is, is it totem pole or open collector or what ?

 

Most (not all) micro pins have many functions. It can be programmed to be input or output and, in some cases, it can have different functions.

 

why do you say the micro is an output ?
in general the diamond symbol is just a picture , you need to look at the proc and see if thats an input or not
also check what type of logic the 4093 is, is it totem pole or open collector or what ?

But usually when the arrow is oriented to the pic, it is considered as in input and when is oriented away it is considered an output.

 

But usually when the arrow is oriented to the pic, it is considered as in input and when is oriented away it is considered an output.

No.
The triangle symbol is just a connection or node. It does not indicate direction, input or output.

 

But usually when the arrow is oriented to the pic, it is considered as in input and when is oriented away it is considered an output.

the word is usual,
the better ( Imho) cad packages have different symbols, and enforce / warn. other , it seems like this have multiple but dont enforce .

at end of of day , conection with flattered cad is made by net name ,

are you wanting us to grade the schematic out of ten or just concerned by being puzzled ?

 

As others have said, the direction of the arrow depends on the CAD package or perhaps a convention chosen by the designer.

If your expectation was aligned with the designer (or the CAD package), the SDATA signal is bidirectional but the arrow points away from the microcontroller.


However, there is another signal where the arrow points towards the microcontroller - it is not clear what this signal is, but indeed the convention here can be very confusing.

 

As others have said, the direction of the arrow depends on the CAD package or perhaps a convention chosen by the designer.

If your expectation was aligned with the designer (or the CAD package), the SDATA signal is bidirectional but the arrow points away from the microcontroller.
View attachment 356391

However, there is another signal where the arrow points towards the microcontroller - it is not clear what this signal is, but indeed the convention here can be very confusing.
View attachment 356393

The second signal is called "shutdown"