INTRODUCTION TO MICROPEOCESSOR
MICRO PROCESSOR AND MICRO CONTROLLER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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S1
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S2
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S0
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S3
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Detailed explanation-1: -The signals of 8085 can be classified into seven groups according to their functions. These are: (1) Power supply and frequency signals (2) Data and Address buses (3) Control bus (4) Interrupt signals (5) Serial I/O signals (6) DMA signals (7) Reset signals.
Detailed explanation-2: -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.
Detailed explanation-3: -In T1, 8085 also sends status signals IO/M, S1, and S0. IO/M specifies whether it is a memory or I/O operation, S1 status specifies whether it is read/write operation; S1 and S0 together indicates read, write, opcode fetch, machine cycle operation, or whether it is in HALT state.