Description: Then to do is specify where to write from our picture (that is, write the XY coordinates of the Is the most critical part is the hardest to understand). Because we are here is to show an entire screen map Film, so we first point from the 12864 beginning to show. That the coordinates of this point is how determined Bit of it? We write data to this point, if followed by write data, that coordinates what would happen Change? First we must clarify what is 12864 how to write data to the GDRAM (graphics display Display RAM) to go. 12864 (ST7920 driver chips) to the screen is divided into two parts (as Figure in the vertical coordinate is divided into two parts of 00 ~ 1F). When we wrote the LCD after the coordinate values (how Why write back would say), ST7920 control chip on the LCD screen of the control process can use the following diagram Pieces to represent: (The following photograph picture a little later found the problem ... it s here in the horizontal c
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smg12864.c
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