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Microprocessor Slides-2 Dr. Ritika Department of Computer Application 8085 MPU ã MPU is device or group of device(as a unit) that communicate with peripherals provide timing signals, direct data flow, and perform computing task as specified by the instructions in memory. 8085 is MPU but with 2 limitations: ã Low order address bus is multiplexed (time-shared) with data bus. The buses need to be demultiplexed. ã Appropriate control signals need to be generated to interface memory and I/O with th
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  MicroprocessorSlides-2 Dr. Ritika Department of Computer Application  8085 MPU 2 ã MPU is device or group of device(as a unit) that communicatewith peripherals provide timing signals, direct data flow, andperform computing task as specified by the instructions inmemory.8085 is MPU but with 2 limitations: ã Low order address bus is multiplexed (time-shared) with data bus.The buses need to be demultiplexed. ã Appropriate control signals need to be generated to interfacememory and I/O with the 8085.  Tri-State Devices 3 ã Interfacing Device necessary to interconnect the components of bus-orientedsystem. ã Devices essential for proper functioning of bus-oriented system. ã have 3 states : logic 1, logic 0, and high impedance. ã Trademark of National Semiconductor. ã It is a useful device that allows us to control when current passes through thedevice, and when it doesn't. ã Third line is called Enable is activated, tri-state device function same as ordinarylogic device.  Tri-State Devices 4 When enable E is high the gate is enabled and the output Q canbe 1 or 0 (if A is 0, Q is 1, otherwise Q is 0). However, when E islow the gate is disabled and the output Q enters into a highimpedance state.
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