QUESTIONH$4(7$ points$)$

A$.$ Explain $2$ differences between Asynchronous and Synchronous serial communication

B$.$ if the device can transmit $10$ char per second find the baud rate, if Data format: $1$ start bit, $7$ data, $1$ parity, $2$ stop bits

C$.$ Interface $8-$ bit input port $(74$LS$245)$ to read the status of switches SW$1$ to SW$8$ to the microprocessor system. Store the status in memory location X$.$ Assume the address of the port is $08$FOH.

a$)$ Draw block circuit diagram circuit, showing address decoding logic, and control signals

b$)$ Write a program to read the status of switches and store the result into $x$ memory location