MICROPROCESSOR 8255
ARCHITECTURE OF 8085
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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mode 0
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mode 1
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mode 2
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none
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Detailed explanation-1: -We call mode 1 as the strobed Input Output or handshake Input Output. We use this mode when the data is supplied by the input device to the microprocessor at irregular interval of time. A port which is functioned to program in mode uses three handshake signals.
Detailed explanation-2: -We call the mode 0 as the simple Input Output or the basic Input Output for performing the simplest mode of operation. Every ports of 8255 can be programmed to work in mode 0. We call mode 1 as the strobed Input Output or handshake Input Output.
Detailed explanation-3: -There are two basic operational modes of 8255: Bit Set/Reset mode (BSR mode). Input/Output mode (I/O mode).
Detailed explanation-4: -Two ports i.e. port A and B can be used as 8-bit I/O ports. Each port uses three lines of port c as handshake signal and remaining two signals can be used as I/O ports. Interrupt logic is supported. Input and Output data are latched.