Home > Uncategorized > PCD8544 | a command not very documented…

PCD8544 | a command not very documented…


Today I was getting some old nokia 3310 LCD back alive and found one kind of weird acting. The display was scrolled up by few lines. I get through datasheet but nothing useful seems to be found at first sight. Getting fed with it I wrote few lines to play over undocumented ones, or I should rather say, reserved commands.
The one I was looking for was obviously the last. (Hail to the Murphy!).
Switching the extended instruction set write(0x21,pin_DC=0) gives you access to 0x40 command, which presents analogy to its normal-instruction-set counterpart.
So, write(0x40 | y_offset,pin_DC=0) gives you Y-scroll or Y-shift command, in single line units.
Seems that controller has more than expected amount of DDRAM…

Cheers!

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