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Do you have size limit or memory size calculator to help set the size of the frame buffer?

The size limit for the LCD frame buffer is 1024x1024x4, which would be a 1k x 1k x 24bpp display. You can compute a frame buffers memory requirements by multiplying the X resolution by the Y resolution by the color depth in bytes. For example, a 320x240 display at 16bpp (2bytes per pixel) would need 320x240x2 = about 150kB. You can also use the bandwidth calculator to compute this value.

LPC247x bus bandwidth calculator:
http://www.lpcware.com/content/nxpfile/lpc247x-lcd-bus-load-calculator

LPC178x and LPC40xx bus bandwidth calculator:
http://www.lpcware.com/content/nxpfile/lcd-bus-bandwidth-calculator-lpc177x8x

LPC18xx and LPC43xx bus bandwidth calculator:
http://www.lpcware.com/content/nxpfile/lcd-bandwidth-calculator-lpc18xx-and-lpc43xx

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