LCD 16*2 Data Sequence Flow chart

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Fan174

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Good evening to all

I am not speaking about code I want to understand communication between MCU and LCD how does microcontroller send data to LCD so I made one flow chart that explain my understanding

I have attached PDF file and I am looking advice with my flow chart
 

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  • LCD Data sequence.pdf
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Have a look on datasheet pinout waveforms of the LCD you are talking about (presumably based on the HD7780 chipset) and you will have a better understanding of the whole process, it just describes what the above flowchart depitcs for example for the writing command:

 
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RS=0; // Select the Command Register by pulling RS LOW
RW=0; // Select the Write Operation by pulling RW LOW
EN=1; // Send a High-to-Low Pusle at Enable Pin
Wait = 450 ;
 

EN=1; // Send a High-to-Low Pusle at Enable Pin
Click to expand...
Confusing description. Actually E is pulsed high for Pweh >= 450 ns.

E is pulsed for each byte read from or written to the LCD controller. In so far I don't understand why it's described only as prepare action in your diagram.
 
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FvM said:
Confusing description. Actually E is pulsed high for Pweh >= 450 ns.

In so far I don't understand why it's described only as prepare action in your diagram.
Click to expand...

What it should be ?
 

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