I don't think that one of those 8051s will work for a couple of reasons. First, for a color bitmapped LCD (lets assume a 24 bit module on the order of 640 x 480) you need to have about 27 I/Os (24 data bits, maybe 3 clocks - pixel, vert, horz). In addition to that you'll need a fast memory (flash will be WAY WAY too slow) interface for your frame buffer. That's even more I/Os. Furthermore I don't think that between the memory controller and the LCD controller you'll do very well. Imagine trying to do 30 frames per second at 640 by 480 with 24 bits. That's about 27 MB of data transfer a second. An 8051 would struggle. I guess it just totally depends on what sort of display he's trying to use.