Source of my knowledge-: https://electronics.stackexchange.com/questions/204337/programmed-io-vs-interrupt-for-devices
https://slideplayer.com/slide/265620/

And my teacher.

So here is what I understand about

1) Programmed IO-:
Here CPU periodically executes instruction which reads READY pin

2) Interrupt driven IO-:
Here CPU checks interrupt at the end of each instruction cycle whereas IO device sends interrupt.
The original flowchart for these are as follows-:



Here is what I have made-:

Programmed IO-:


interrupt driven io-:


I just want to know if my understanding of flowchart is correct or not?

 

For starters, a diamond shape is used for representing the IF-THEN-ELSE control structure.
You cannot have three exit points from the structure.

Programmed I/O or interrupt driven I/O can take two forms, blocking and non-blocking.
Blocking means while a condition is being tested no other process can take place.
Non-blocking means that while waiting for an event to happen the CPU can continue with other processes.
You need to choose one or the other.

 

Source of my knowledge-: https://electronics.stackexchange.com/questions/204337/programmed-io-vs-interrupt-for-devices
https://slideplayer.com/slide/265620/

And my teacher.

So here is what I understand about

1) Programmed IO-:
Here CPU periodically executes instruction which reads READY pin

2) Interrupt driven IO-:
Here CPU checks interrupt at the end of each instruction cycle whereas IO device sends interrupt.
The original flowchart for these are as follows-:
View attachment 250837


Here is what I have made-:

Programmed IO-:
View attachment 250838

interrupt driven io-:
View attachment 250839

I just want to know if my understanding of flowchart is correct or not?

I guess the obvious question is- why are you looking at 1 flow chart that makes sense, and rewriting it? You should be able to easily understand the original flow-chart....

 

I

I guess the obvious question is- why are you looking at 1 flow chart that makes sense, and rewriting it? You should be able to easily understand the original flow-chart....

could not relate to original flowchart that much so I made one, am I right or wrong?