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This set of MCQs helps students to learn about special purpose programmable peripheral devices and their Interfacing which is a multiport device. The ports may be programmed in a variety of ways as required by the programmer. The device is very useful for interfacing peripheral devices. The term PIA, Peripheral Interface Adapter is also used by some manufacturer.
In mode 2, if N is loaded as the count value, then after (N-1) cycles, the output becomes low for
In 8251A, the pin that controls the rate at which the character is to be transmitted is
The number of counters that are present in the programmable timer device 8254 is,
1
2
3
4
The operation that can be performed on control word register is,
Read operation
Write operation
Read and write operations
None
The mode that is used to interrupt the processor by setting a suitable terminal count is,
Mode 0
Mode 1
Mode 2
Mode 3
The generation of a square wave is possible in the mode.
Mode 1
Mode 2
Mode 3
Mode 4
In control word register, if SC1=0 and SC0=1, then the counter selected is
Counter 0
Counter 1
Counter 2
None
The counter starts counting only if,
GATE signal is low
GATE signal is high
CLK signal is low
CLK signal is high
In control word format, if RL1=1, RL0=1 then the operation performed is,
Read/load least significant byte only
Read/load most significant byte only
Read/load LSB first and then MSB
Read/load MSB first and then LSB
If BCD=0, then the operation is
Decimal count
Hexadecimal count
Binary count
Octal count
The control word register contents are used for
Initializing the operating modes
Selection of counters
Choosing binary/BCD counters
All of the mentioned
Which of the following is not a mode of data transmission?
Simplex
Duplex
Semi duplex
Half duplex
If the data is transmitted only in one direction over a single communication channel, then it is of
Simplex mode
Duplex mode
Semi duplex mode
Half duplex mode
If the data transmission takes place in either direction, but at a time data may be transmitted only in one direction then, it is of
Simplex mode
Duplex mode
Semi duplex mode
Half duplex mode
TXD(Transmitted Data Output) pin carries serial stream of the transmitted data bits along with,
Start bit
Stop bit
Parity bit
All of the mentioned
