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interfacing 1024*600 pixel TFT lcd with LPC1788

hi friends., i am interfacing 10.1" TFT lcd with LPC1788.I Got some pixel flickering issue and color changing issue.at final i solved PIXEL flickering and color changing issue :)..but the pixel brightness is low.is it because of insufficient clock or something else?

actually i need more than 40 MHZ (44MHZ) for lcdclk but by using PCD bit in lpc1788,i can generate 40 MHZ maximum.i know we can generate 48 MHZ(core clock)by using PLL concept and give to lcd by enabling BCD bit.but i dont know how to operate SDRAM In 48 MHZ?

Now i want to generate 48 MHZ For lcd at a same time SDRAM Should run in 120 MHZ is it possible?

Is it possible to do in any other method? else tell me what i have to do for good brightness.thanks Advance..