I purchased a JHD529 graphic lcd a few weeks ago, the part number is 12864F. On the face of it, it would appear to be pretty similar to most other glcd's based on the ST7920/1. I have it interfaced to a PIC 16F877A, with some additional circuitry to generate the required negative voltages. I can use the GLCD fine in character mode, but when I attempt to write to the screen in graphics mode I can seemingly only write to the first 19 lines (Y), but fully across the screen (X). Being fairly new to electronics and PIC/GLCD programming I went searching the internet. It would appear from all the documents that I read that most GLCD's are split into two individual chips which you have to select by setting chip select pins high. Thus in order to write to the lower half of the screen or the left / right side you set CS1 or CS2 high depending on the requirement.
This seems pretty straight forward until I realised that my GLCD doesn't appear to have any chip select pins. My question therefore is whether it is possible to have a GLCD without chip select pins, or if I have some really strange GLCD which should never have existed
Link to the short datasheet:
**broken link removed**
I also have the full datasheet but couldn't find it online to link to.
Thanks,
Paul.
This seems pretty straight forward until I realised that my GLCD doesn't appear to have any chip select pins. My question therefore is whether it is possible to have a GLCD without chip select pins, or if I have some really strange GLCD which should never have existed
Link to the short datasheet:
**broken link removed**
I also have the full datasheet but couldn't find it online to link to.
Thanks,
Paul.