Search:

Assembly Language Interview FAQs

Submit Interview FAQ

Home » Interview FAQs » Assembly Language

RSS Feeds

Assembly Language

Comments: 0

Write the features of mode 0 in 8255?

Two 8-bit ports (port A and port B) and two 4-bit ports (port C upper and lower) are available. The two 4-bit ports can be combined used as a third 8-bit port. 2. Any port can be used as an input or output port. 3.Output ports are latched. Input port...

Posted By:Archie Evans Posted On: Nov 24

Assembly Language

Comments: 0

What are the features used mode 1 in 8255?

Two groups – group A and group B are available for strobed data transfer.
1. Each group contains one 8-bit data I/O port and one 4-bit control/data port. 2. The 8-bit data port can be either used as input or output port. The inputs and outputs both ...

Posted By:Von Fischer Posted On: Apr 07

Assembly Language

Comments: 0

What are the signals used in input control signal & output control signal?

Input control signal
- STB (Strobe input)
- IBF (Input buffer full)
- INTR(Interrupt request)

Output control signal
- OBF (Output buffer full)
- ACK (Acknowledge input)
- INTR(Interrupt request)

Posted By:Rald Fischer Posted On: Apr 01

Assembly Language

Comments: 0

What are the features used mode 2 in 8255?

The single 8-bit port in-group A is available.
1. The 8-bit port is bi-directional and additionally a 5-bit control port is available. 2. Three I/O lines are available at port C, viz PC2-PC0. 3. Inputs and outputs are both latched. 4. The 5-bit cont...

Posted By:Adalrico Fischer Posted On: Sep 21

Assembly Language

Comments: 0

What are the modes of operations used in 8253?

Each of the three counters of 8253 can be operated in one of the following six modes of operation.
1. Mode 0 (Interrupt on terminal count)
2. Mode 1 (Programmable monoshot)
3. Mode 2 (Rate generator)
4. Mode 3 (Square wave generator)
5. Mode...

Posted By:Adelyte Miller Posted On: Sep 25

Assembly Language

Comments: 0

What are the different types of write operations used in 8253?

There are two types of write operations in 8253
(1) Writing a control word register
(2) Writing a count value into a count register

The control word register accepts data from the data buffer and initializes the counters, as required. The contr...

Posted By:Adela Fischer Posted On: Sep 25

RSS Feeds:	Articles \| Forum \| New Users \| Activities \| Interview FAQ \| Poll \| Hotlinks
Social Networking:	Hall of Fame \| Facebook \| Twitter \| LinkedIn
Terms:	Terms of Use \| Privacy Policy \| Contact us