Hi, Andy:

Thanks for your responding.
The problem is solved. There is nothing worng with uPSD3234A CPU. The problem is from my 51 LINKER. I have two pieces of code, one is put in secondary flash, one is put in main flash. I defined main flash hex starts from 8000h. There are 5 files for this hex. There are Startup and Main. I put ORG 8000h in the startup and linked sequence is startup+main+main2+main3...I supposed that Startup code will be 8000h. There are some offsets for main....But actually Main code starts from 8000h. startup starts from other address. so when I issued LJMP command from secondary flash, it has reached the main flash, but the code is not code what I want... Anyway, finally I got it worked.

Thanks.

Frank