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mvi move immediate instruction this form of the instruction is used to copy 8bit data specified in the instruction
example memory to registers example write assembly language statement to copy data byte 36h stored at 2025 h
memory to registerthis instruction is used to copy the contents of a memory locations whose address is specified by the hl
example register to memory example write assembly language statement to copy 25h stored in register d to memory location
mov move instructionit copies the contents of the sources register into destination register the general format is this instruction is
data copy operationsinstructions which are used to copy data from one location to another location kept in this category the
complete instruction set of 8085 microprocessor there are total 256 instructions in 8085 microprocessor these instructions are classified
normal 0 false false false en-in x-none x-none
de multiplexing address data bus ad7- ad0as it is already discussed that lower order address bus a7- a0 is multiplexed with data bus
sod outputserial output data single bit can be sent out through this pin using sim command discussed in details in
sid inputserial input data single bit can be accepted through this pin using rim command discussed in details in
serial input output ports for serial input and output there are two pins in 8085
resetin inputit is an active low signal when it goes low program counter is reset to zero and busses are tri stated it also
hilda output it is called hold acknowledge signals it is active high i e it goes high when microprocessor receives hold
hold inputthis signal when goes high indicates that other device such as dma controller is requesting the use of address and
ready inputmicroprocessor has to communicate with other peripherals which are slow as compared to the microprocessor ready
externally initiated signalsother than interrupt there are followings externally initiated signals available in 8085
interrupt signalsthere are five interrupt signals in 8085 microprocessor these signals are used to inter rut the current
power supply and clock frequency there are following pins for power supply and clock frequency signalsvcc 5 v power
status signals there are three status signals iom s and s1 all these signals are output signalsio m - it is a status
control signalsthere are two control signals and one special ale in this category all these signals are output
multiplexed address data bus pins ad7 - ad are used for multiplexed address data bus this bus is bidirectional input output and serves
higher order address bus the 8085 microprocessor has 8 pins dedicated to higher order address a15 - a8 these pins are used to
basic operations of 8085 microprocessor the 8085 microprocessor performs followings five basic operations 1 opcode fetch reading
control busthe control bus comprises of various single lines that carry various control signals for synchronizing