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Address bus and data bus in 8085 μp respectively are
Address bus is unidirectional while data bus is bidirectional.
Maximum memory that we can interface to 8085 up is _______________ byte
Address lines in 8085 μp = 16 lines so maximum memory which can be interfaced to 8085 μp
Which signal is used to demultiplex lower address byte and data byte
ALE (address latch enable) is used to demultiplex lower address byte and data byte.
Ready signal is used to
Ready signal is used to synchronise slow peripheral with microprocessor.
What is the difference between I/O mapped I/O and memory mapped I/O.
In case of I/O mapped I/O 8 bit address is used to identify I/O while in case of memory mapped I/O 16 bit address is used to identify I/O.
Frequency of operation of 8085 microprocessor is ______________ MHz
Frequency of operation of 8085 microprocessor is 3 MHz.
Bit position of five flags in flag register is given. Which one of the following is correct?
How many buses are connected as part of the 8085A microprocessor?
LDAXBThe addressing mode is
The addressing mode is indirect because the address of the data is given indirectly by the content of BC pair.
In logical operations one operand is always.
In logical operations one operand is always accumulator.
Which flag is affected, when instruction CMA is executed.
due to execution of CMA (complement the accumulator) none of the flags are affected.
8155 is a programmable I/O ports and timer.
DAD instruction has
DAD instruction only affects the carry flag when result exceeded 16 bits.
DAA is used to
DAA is a one byte instructions used for changing the content of accumulator from binary value to two 4-bit binary coded decimal digits.
Assume HL pair contains 20FFH.Which instruction will transfer the program to location 20FFH?
PCHL →• It implies that content of HL are copied to program counter so when 20FFH is loaded to PC, program will transfer to location 20FFH.
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