Has anyone used the DDRAM of a HD44780U LCD as a general RAM

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Myself

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Dear All,

As far as I can understand it is possible to use the DDRAM or CGRAM of a HD44780U LCD as a general RAM.

I wonder if any one of you has used it? If so could you please tell me how?

If possible please give me your project.

Myself
 

Re: Has anyone used the DDRAM of a HD44780U LCD as a general

Yes you can use the ram of the LCD without problems for general purpose even if you need to display 2 x 16 characters as the LCD has much more memory as you can see displayed (if you do not scoll the display).

I did this a long time ago on an 89C2051 when I was completly out of ram

The only things that speak against this are the software overhead and that you need to connect R/W of the display to an IO pin of your MCU ...

All you have to do is set the adress pointer to desired adress of CG or DD memory and write/read your databyte to/from there as if you would write a "normal" character to the display.

best regards
 

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