Thanks all,

I know there many power chips but I must use 8052 because I'm required to use it.
I dont get problem with basic conecpt. What I need is some advise, or notice that help me finish this faster.
I'm family with 8051, but this is the first time I use 8052. I know there is not much different between them. But it's helpful to me if you can post a piece of code that using ext ram with 8052 (including specify address, pin connection, etc..).

Thanks again for any hep.