our realistic work:
compatibility: sends one byte data on data port line and take the output by leds,
nibble mode: sends data on upper 4bits of the data port and receive by the upper bits of the status register . and control register used for controling the receiver device.so it take two clock to send one byte of data.
byte mode : sends one byte data and receive one byte data by the data register in single clock.
but my problem is these all modes performing simplex communication unidirectional , i want to make it half duplex if it is possible, please tell me its very humble request to u.