EE6502 MPMC 2marks
Anna University Regulation 2013 EEE EE6502 MPMC 2marks & 16marks for all 5 units are provided below. EE6502 MPMC Short answers, Question Bank for Microprocessor Microcontroller is listed down for students to make perfect utilization and score maximum marks with our study materials.
EE6502 – MICROPROCESSORS AND MICROCONTROLLER
UNIT-1 8085 PROCESSOR
TWO MARKS
1. What is microprocessor? Give the power supply &clock frequency of 8085
A microprocessor is a multipurpose, programmable logic device that reads binary instructions from a storage device called memory accepts binary data. As input and processes data according to those instructions and provides result as output. The power of 8085 is +5v and clock frequency in 3MHZ.
2. List the allowed register pairs of 8085.
B-C register pair D-C register pair H-L register pair.
3. Mention the purpose of SID and SOD lines
SID(serial input data line): It is an input line through which the microprocessor accepts serial data.
SOD(serial output data line): It is an output line through which the microprocessor sends output serial data.
4. What is an opcode?
The part of the instruction that specifies the operation to be performed is called the operation code or opcode.
5. What is the function of IO/M signal in the 8085?
It is a status signal. It is used to differentiate between memory locations and I/O operations when this signal is low (IO/M=0) it denotes the memory related operations. when this signal is high(IO/M=1)it denotes an I/O operation
6. What is meant by wait state?
This state is used by slow peripheral devices. the peripheral devices can transfer the data to or from the microprocessor by using READY input line.the microprocessor remains in the wait state as long as READY line is low. during the wait state, the contents of the address, address/data and control buses are held constant.
7. Explain priority interrupts of 8085?
The 8085 microprocessor has five interrupt inputs.they are TRAP,RST 7.5,RST 6.5,RST 5.5,and INTR.these interrupts have a fixed priority of interrupt service.If two or more interrupts go high at the same time,the 8085 will service them on priority basis.the TRAP has the highest priority followed by RST7.5,RST6.5,RST5.5.the priority of interrupts in 8085 is shown in the table.
Interrupts Priority
TRAP 1
RST7.5 2
RST6.5 3
RST5.5 4
INTR 5
8. What is the signal classification of 8085?
All the signals of 8085 can be classified into 6 groups
1. Address bus 2. Data bus 3. Control and status signals
4. Power supply and frequency signals 5. Externally initiated signals
6. Serial I/O ports
9. Steps involved to fetch a byte in 8085?
i)the pc places the 16-bit memory address on the address bus
ii)the control unit sends the control signal RD to enable the memory chip
iii)the byte from the memory location is placed on the data bus
iv)the byte is placed in the instruction decoder of the microprocessor and the task is carried out according to the instruction.
10. Define instruction cycle,machine cycle and T-state?
Instruction cycle is defined as the time required completing the execution of an instruction. Machine cycle is defined as the time required completing one operation of accessing memory,I/O or acknowledging an external request.T –cycle is defined as one subdivision of the operation performed in one clock period.
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