Before expecting others to check it, what checking have you done?

What debugging and testing have you done yourself?

Have you carefully checked it against the device datasheets?

Have you used an oscilloscope to see what's actually happening on the wires?

Have you run it in Simulation - either "manually" (using pencil & paper), or in a simulator application?

See: http://www.8052.com/forum/read/169932
And: http://www.8052.com/forum/read/169325
And: http://www.8052.com/forum/read/169331

Here are some more debugging tips & techniques:

http://www.8052.com/faqs/120313

http://www.techonlineindia.com/article/0...anner.aspx