Hello All,

I have edited the circuit according to the suggestions provided.

The circuit is shown below:


LCD has been moved to port1 for direct control(4 bit mode).

Additional latch is used to control other peripherals like buzzer, relay, leds etc...
To use these peripherals, the following steps are followed:
1> Set P1.7 - Used to deselect the NVRAMS.
2> Data is placed on Port 0.(MOV P0,peripherals)
3> Strobe P1.6 - Used to latch the data.
4> Deselect P1.7 - Now NVRAMS can be used.

To access NVRAMS - MOVX is used.

I guess, I can go ahead designing the PCB now.

Rgds
Raj S