8085 microprocessor data and address bus:
Below, we have explained the 8085 Microprocessor Data and Address Bus in detail.
- 8085 has 8-bit data and 16 address bits.
- Hence it has 216 memory locations
- Memory size is 216 = 64 Kb
- 8085 has 8 data lines which are multiplexed with address lines (AD0- AD7)
- The microprocessor cedes control buses to the external peripheral when the HOLD pin is triggered by an external signal.
- After finishing the current instruction's execution, it puts an end to it.
- For instance, Direct Memory Access (DMA) data transfer uses the HOLD signal.
- With this DMA, the external Input/Output devices talk to the RAM directly without constantly interfering with the processor.
- This signal signifies that the address and data buses are being requested by another master.
Immediate addressing mode:
- In this mode, the instruction itself specifies the 8/16-bit data as one of its operands.
- For instance, MVI K, 20F: denotes the copying of 20F into register K.
- The number specified in the instruction itself serves as the operand.
- The source operand in immediate addressing mode is always data.
- If the data is 8 bits or 16 bits, the instruction will be 2 bytes long and 3 bytes long, respectively.
Consider the following statement(s) (1) In 8085, 16-bit address bus, which can address up to 64KB (2) HOLD signal indicates that another master is requesting the use of the address and data buses. (3) MVI K, 20F is an example of Immediate addressing mode, Which of the above statement(s) is/are correct?
The assertions The HOLD signal on an 8085, 16-bit address bus that may address up to 64KB, and MVI K, 20F are examples of valid immediate addressing modes. HOLD signals also indicate that another master is seeking the usage of the address and data buses.
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