Dear all ,
I am using external ROM for data reading & as well as want to read the status of 24 nos. of switch through AD7...AD0 port in combination with RD & PD1,PD2,PD3 signals.
i am using 74ls138 as address decoder to read ROM & 3 nos column.
i am unable to read back the status of the pressed switch , As Data reading from ROM not proper.
I am using ATMEGA162 as controller.......PLS HELP