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Microprocessor

Microprocessor
Number of Hex digits needed to represent the 20-bit address of a memory location are

 5
 16
 4
 20

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Microprocessor
In a microcomputer , the address of memory locations are binary numbers that identify each memory circuit where a byte is stored. If a microcomputer uses 20-bit address, then numbers of different memory locations are

 220-1
 220 - 1
 20
 220

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Microprocessor
Which components are NOT found on chip in a microprocessor but may be found on chip in a microcontroller?

 EPROM & PORTS
 SRAM & USART
 EPROM, USART & PORTS
 SRAM, EPROM & PORTS

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Microprocessor
The execution of RST n instruction causes the stack pointer to

 increment by two
 decrement by two
None of these
 remain unaffected

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Microprocessor
A sequence of two registers that multiplies the content of DE register pair by two and stores the result in HL register pair (in 8085 assembly language) is

 XCHG & DAD H
 PCHL & DAD D
 XTHL & DAD H
 XCHG & DAD B

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Microprocessor
In an intel 8085A, which is the first machine cycle of an instruction?

 An I/O read cycle
 An op-code fetch cycle
 A memory write cycle
 A memory read cycle

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