Hi Aman,

it seems, you have some code inside your initialization, which put TXD to low level.

Maybe, you set all ports to low, which was very dangerous, since then external outputs fighting against your micro.

You can only set such port pins to low, which are used as outputs only and if it was really needed.


Typically on most initialization routines the ports are forced into the reset state:

P0 = 0xFF;
P1 = 0xFF;
P2 = 0xFF;
P3 = 0xFF;


Peter