Ncmk

Q.4. Draw and explain architecture of 8085 in details.

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Control Unit : Generates signals within uP to carry out the instruction, which has been decoded. In reality causes certain connections between blocks of the uP to be opened or closed, so that data goes where it is required, and so that ALU operations occur. Arithmetic Logic Unit : The ALU performs the actual numerical … Read more

Q. 3. Explain the various addressing modes of 8085 with example

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Answer : These are various technique to specify data for instruction Direct addressing mode Register addressing mode Register addressing mode Immediate addressing mode Implicit addressing mode   Direct addressing mode : In this addressing mode the address of the operand is given in the instruction. Ex: STA 2000H &IN 02H  Register addressing mode: In this … Read more

Q.2. With neat diagram explain interrupt structure of 8085.

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Interrupts are the signals generated by the external devices to request the microprocessor to perform a task. There are 5 interrupt signals, i.e. TRAP, RST 7.5, RST 6.5, RST 5.5, and INTR. Interrupt are classified into following groups based on their parameter : Vector interrupt : In this type of interrupt, the interrupt address is … Read more

Q.1. Draw and explain timing diagram for ‘Write operation’ in minimum mode of 8086.

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Answer : The timing diagram for write operation in minimum mode is shown in fig above: When processor is ready to initiate the bus cycle, it applies a pulse to ALE during T1. Before the falling edge of ALE, the address, BHE, M/IO, DEN and DT/R must be stable i.e. DEN = high and DT/R … Read more