ASSIGNMENT 8
Textbook Assignment: “Input/Output (I/O) and Interfacing,” chapter 7, pages 7-20 through 7-38.
8-1.
8-2.
8-3.
8-4.
The read/write control logic accepts control
signals from which of the following devices?
1. The data bus
2. The control bus
3. The master clock
4. The USART
To program the USART for the applicable
interface when it is in an idle state, which of the
following signals/words is required?
1. A reset signal
2. A clock signal
3. A new set of data words
4. A new set of control words
The universal synchronous-asynchronous receiver
transmitter is enabled for reading/writing
operations when which of the following signals is
true?
1. The WRITE DATA
2. The CHIP SELECT
3. The CONTROL DATA
4. The DATA SET READY
When the WRITE DATA (WD) signal is true, it
means which of the following things?
1. It indicates the microprocessor is placing data
on the data bus
2. It indicates the microprocessor is ready to
receive data or control words
3. It identifies the write operation as a data or
control word
4. It enables the universal
synchronous/asynchronous receiver
transmitter for writing operations
8-5.
8-6.
8-7.
8-8.
8-9.
When the READ DATA (RD) signal is true, the
microprocessor is ready for which of the
following activities?
1. To receive data only
2. To receive status words only
3. To receive data and status words
4. To receive clock signals
The transmit control logic converts the data bytes
stored in the transmit buffer into which of the
following forms?
1. An asynchronous bit stream
2. Start bits
3. Stop bits
4. Parity bits
A start bit is used for which of the following
purposes?
1. To initiate data transfer
2. To alert the output device
3. To control transmit logic
4. To program protocol
A parity bit is used for which of the following
purposes?
1. To regulate signal flow
2. To specify data type
3. To detect errors
4. Each of the above
The receive buffer stores which of the following
information?
1. The output bit stream
2. The protocol signals
3. Serial bytes
4. Parallel bytes
51
