pin configuraton contn.

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pin 29- this is PSEN pin which stands for program store enable pin. it is used to read a signal from the external program memory.

pin 31- this is a EA pin which stands for external access input. it is used to enable or disable the external memory interfacing.

pin 30- This is ALE pin which stands for ADDRESS LATCH ENABLE. it is use to demultiplex the address data signal of the port.

pin 32-39- these pins are known as port0. it serves as i/p port. lower order address and data bus signals are multiplexed using this port.

pin 40- this pin is used to provide power supply to the circuit.