SED1335 Graphic LCD driver problem

Hi Gents;

I have been trying to make my new shining Winstar WG320240C LCD (

formatting link
) with S1D13305F formerly known as SED1335 controller by using an ATMEL ATMEGA162 uc. I have written the below code but when I power up my circuit, LCD starts flickering continuesly. I cannot initialize the screen and make it running to display some words :(

Could you please check my code and circuit below if you see something wrong and drop me a line or two ;) If there is also anyone who worked this LCD out, please send me any reference, cuz I am getting crazy soon..

For connections I set up like:


----- |-- PIN1 Ground |-- PIN2 +5V |-- PIN3 ~apprx. -16V |-- PIN4 RD/E connected to PA6 |-- PIN5 WR/RW connected to PA5 |-- PIN6 Ao connected to PA7 |-- PIN7 DB0 connected to PC0 |-- PIN8 DB1 connected to PC1 |-- PIN9 DB2 connected to PC2 LCD |-- PIN10 DB3 connected to PC3 |-- PIN11 DB4 connected to PC4 |-- PIN12 DB5 connected to PC5 |-- PIN13 DB6 connected to PC6 |-- PIN14 DB7 connected to PC7 |-- PIN15 CS connected to Gnd |-- PIN16 RES connected to PD7 |-- PIN17 Negative voltage output connected to PIN3 through a POT |-- PIN18 Frame Ground connected to Gnd |-- PIN19 NC |-- PIN20 NC

My code is:
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Aris Konstantinos
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Hi there

I am working on exactly the same Winstar LCD using a AT89c52 to start with at this moment.

I had the same problem as you. I played with the initialization values and I got it right. At the moment I am at work and I don't have the C code with me but as soon as I get it I will sent it to you.

Try the fiddling with the pot controlling the negative voltage. That solved one of my early problems.

Check these values

It took me a while to calculate the right ones. I still quite don't understand it I didn't understand what they mean by the frame frequency (is it the power frequency 60Hz in the states while 50Hz in Australia)

I fluked it somehow but it works now. I am still going crazy over it.

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