MICROPROCESSOR 8255
ARCHITECTURE OF 8085
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The pin that clears the control word register of 8255 when enabled is
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CLEAR
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SET
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RESET
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CLK
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Explanation:
Detailed explanation-1: -CS = 0, the 8255 is enabled. The RESET input (pin 35) is connected to the RESET line of system like 8085, 8086, etc., so that when the system is reset, all the ports are initialized as input lines.
Detailed explanation-2: -The control word format of the 8255 is shown in Fig. below. The contents of the control register are called the control word that specifies the input/ output functions of each port. The control word register can be accessed to write the control word by selecting AD 1 and AD 0 in high condition i.e. both ON.
Detailed explanation-3: -The 8255 chip is used to expand the I/O ports of microcontrollers.
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