What is microprocessor bar?

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What is microprocessor bar?

This signal indicates that selected I/O or memory device is to be read and data is available on the data bus. It is tristated during HOLD and HALT. Concept: Introduction to Microprocessors and Organization of 8085.

What is the significance of hold and Hlda pin in 8085?

HOLD − This signal indicates that another master is requesting the use of the address and data buses. HLDA (HOLD Acknowledge) − It indicates that the CPU has received the HOLD request and it will relinquish the bus in the next clock cycle. HLDA is set to low after the HOLD signal is removed.

Why pin 12 to 19 are called multiplexed explain briefly?

The size of the data bus of the 8085 microprocessor is 8 bits. However, to reduce the number of bus lines these 8-bit data bus lines are multiplexed with the 8-bit address bus. These are shown by pin number 12 to 19. The pin configuration denotes the lower order multiplexed address and data bus bits from AD0 to AD7.

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What are different interrupts of 8085 microprocessor?

There are 5 Hardware Interrupts in 8085 microprocessor. They are – INTR, RST 7.5, RST 6.5, RST 5.5, TRAP. Software Interrupts are those which are inserted in between the program which means these are mnemonics of microprocessor.

What is S0 and S1 8085?

This signal separates memory and I/O devices. Status signals(S0 and S1): These are output status signals used to give information of operation performed by microprocessor. The S0 and S1 lines specify 4 different conditions of 8085 machine cycles.

What is ale explain the functions of ale in 8085?

ALE (Address Enable Latch) is the control signal which is nothing but a positive going pulse generated when a new operation is started by microprocessor. So when pulse goes high means ALE=1, it makes address bus enable and when ALE=0, means low pulse makes data bus enable.

Why address and data buses are multiplexed in the 8085?

8085: The main reason of multiplexing address and data bus is to reduce the number of pins for address and data and dedicate those pins for other several functions of microprocessor. These multiplexed set of lines used to carry the lower order 8 bit address as well as data bus.

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What is bus explain the bus structure Why address and data bus is multiplexed in 8085 microprocessor?

The data bus and the low order address bus on the 8085 microprocessor are multiplexed with each other. This allows 8 pins to be used where 16 would normally be required. The hardware interface is required to demultiplex the bus by latching the low order address in the first T cycle, on the falling edge of ALE.

What are the features of 8085 microprocessor?

Features of 8085 Microprocessor:

  • 1.It is an 8-bit microprocessor i.e. it can accept, process, or provide 8-bit data simultaneously.
  • 2.It operates on a single +5V power supply connected at Vcc; power supply ground is connected to Vss.
  • 3.It operates on clock cycle with 50\% duty cycle.
  • 4.It has on chip clock generator.

What is address bus and data bus in 8085 microprocessor?

1) Address Bus (A15-A8 and AD7-AD0): The microprocessor 8085 has 16 bit address lines from A15-A8 and AD7-AD0. These lines are used to transfer 16 bit address of memory as well as 8-bit address of I/O ports. 2) Data Bus: The lower 8 lines (AD7-AD0) are often called as multiplexed data lines.

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What is the capacity of 8085 microprocessor?

8 bit microprocessor (8085 microprocessor can read or write or perform arithmetic and logical operations on 8-bit data at time) It has 8 data lines and 16 address lines hence capacity is 216 = 64 kB of memory Cock frequency is 3 MHz It requires +5V power supply.

What are the different bus types of microprocessors?

A microprocessor will have three types of buses, i.e., data bus, address bus, and control bus. IPC (Instructions Per Cycle) – It is a measure of how many instructions a CPU is capable of executing in a single clock. Clock Speed – It is the number of operations per second the processor can perform.

What is 8085 flag register in microprocessor?

8085 is a second generation 8 bit microprocessor and is the base for studying and using all the modern microprocessors available in the market. Flag register is the second most useful component in all the generations of microprocessor, the first one being the accumulator.