CGRAM,DDRAM in 2x16 Character LCD - NHD-0216K1Z-FSW-FBW-L

pradeepsysargus

• June 23, 2016 09:07

We are having a NHD-0216K1Z-FSW-FBW-L.

I wish to understand what CGRAM and DDRAM are for.
Can I use them in the code.?

I have seen the sample code for 8-bit mode in the datasheet. Looks like there is no mention of CGRAM and DDRAM in this code.

Thanks,
Pradeep Ch.

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  Ted M.

  NHD Staff

  • June 24, 2016 09:07

  Hi Pradeep,
  
  The DDRAM or (Display data RAM) contains the character data that is displayed on the screen. It stores the 8-bit standard characters preset for the display in 80x8 bits for up to 80 characters. Their address locations can be found on page 5 of the display specification:

  https://newhavendisplay.com/content/specs/NHD-0216K1Z-FSW-FBW-L.pdf

  The CGRAM or (Character Generator RAM) is customizable, and can be used to write custom character patterns in a 5x8 dot format. Users can program this area to create and display up to 8 custom characters.
  Details on how to program the CGRAM can be found on page 16 of the controller specification:

  https://newhavendisplay.com/content/app_notes/ST7066U.pdf
  
  -Ted

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