C51: Interfacing Flash AT29C512 with AT89C51

"Why should we not write to ACC directly in 'C'?"

You should not do it in any high-level language!

Because, when you use a high-level language (eg, 'C'), you delegate control of the low-level CPU registers to the compiler.

See: http://www.keil.com/forum/docs/thread8360.asp

"To call recursively, I believe it should be declared as 'reentrant'"

Even that won't help you if you call it recursively in an infinite loop!

I still recomend that you start with the "Hello World" sample.

The whole process of creating, building, and running the "Hello World" sample is explained in the Getting Started Guide. You should read and follow this - it will give you a proper introductions to the tools, how they work, and how to use them - rather than just jumping-in blindly at the deep-end!

http://www.keil.com/support/man/docs/uv3/uv3_creating_apps.htm

Then how come Rx() function works,
and could you tell me why do we add 48?

I mean, to be called recursively it ought to be declared as reentrant, else no difference na

try checking status of ti and ri before getting into loop

Just following your advice, Hello World
Hope am not testing your patience Sir,
kindly explain this,
In the program, Rx() where we write to ACC works,
but Tx() where we read from ACC does not work,

ACC is defined in REG51.h, then should not we write to ACC?

Thank you Sir,
the links were very helpful,
specially for send byte
You explained quite patiently,
Thanks again for taking time out,

Thanks for all the help
That little devil was in the while loop
Tx(){
SBUF = ACC;
while(TI){}
TI = 0
}

Surely learnt a lot hunting it down,
Thanks again