The target device of my program is Winbond W78E516B with 64k Flash ROM and my program size is just 29k, I want to know why there is a error of "CLOCKCAL V1.C(1221): error C249: 'DATA': SEGMENT TOO LARGE" after compiling with Keil C.
Zeusti,
It's not a bug!
Using the large model comes with a price (not least might be fending off the tongue of Erik).
I would suggest you take time to read 'the bible' before you give yourself further promotion.