Hi,

I am using a 32K external NVRAM. and EA= Vcc.

I guess I cant use the whole 32K external code of the NVRAM if I am using a AT89S53. I'll need to use only 20K only of the whole 32K. As far as I understand this is because when I have a jump 3000H command on the internal CODE memory, since AT89S53 has only 12k, it tries to access external code memory placing the addrs 3000H on the P0 and P2 ports. Am I right.??? How can I control the CS???


Even though this topic is intersting, I fail to understand why there are very few replies...

Rgds
Raj