8085 FAQ R.RAJKUMAR DEPT OF CSE SRM UNIVERSITY. FAQ What is a Microprocessor? - Microprocessor is a program-controlled device, which fetches the instructions.

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Presentation transcript:

8085 FAQ R.RAJKUMAR DEPT OF CSE SRM UNIVERSITY

FAQ What is a Microprocessor? - Microprocessor is a program-controlled device, which fetches the instructions from memory, decodes and executes the instructions. Most Micro Processor are single- chip devices. Why 8085 processor is called an 8 bit processor? - Because 8085 processor has 8 bit ALU (Arithmetic Logic Review). Similarly 8086 processor has 16 bit ALU.

FAQ Define HCMOS? - High-density n- type Complimentary Metal Oxide Silicon field effect transistor. What does microprocessor speed depend on? - The processing speed depends on DATA BUS WIDTH.

FAQ Is the address bus unidirectional? - The address bus is unidirectional because the address information is always given by the Micro Processor to address a memory location of an input / output devices. Is the data bus is Bi-directional? - The data bus is Bi-directional because the same bus is used for transfer of data between Micro Processor and memory or input / output devices in both the direction.

FAQ What is meant by LATCH? - Latch is a D- type flip-flop used as a temporary storage device controlled by a timing signal, which can store 0 or 1. The primary function of a Latch is data storage. It is used in output devices such as LED, to hold the data for display. What is the difference between primary & secondary storage device? - In primary storage device the storage capacity is limited. It has a volatile memory. In secondary storage device the storage capacity is larger. It is a nonvolatile memory. Primary devices are: RAM / ROM. Secondary devices are: Floppy disc / Hard disk.

FAQ What is interrupt? - Interrupt is a signal send by external device to the processor so as to request the processor to perform a particular work. What is cache memory? - Cache memory is a small high-speed memory. It is used for temporary storage of data & information between the main memory and the CPU (center processing unit). The cache memory is only in RAM.

FAQ What is flag? - Flag is a flip-flop used to store the information about the status of a processor and the status of the instruction executed most recently What is stack? - Stack is a portion of RAM used for saving the content of Program Counter and general purpose registers.

FAQ Difference between static and dynamic RAM? - Static RAM: No refreshing, 6 to 8 MOS transistors are required to form one memory cell, Information stored as voltage level in a flip-flop. Dynamic RAM: Refreshed periodically, 3 to 4 transistors are required to form one memory cell, Information is stored as a charge in the gate to substrate capacitance. What is the disadvantage of microprocessor? - It has limitations on the size of data. Most Microprocessor does not support floating-point operations.