![]() This signal is used to differentiate between IO and Memory operations, i.e. When the pulse goes down it indicates data. When the pulse goes high, it indicates address. WR − This signal indicates that the data on the data bus is to be written into a selected memory or IO location.ĪLE − It is a positive going pulse generated when a new operation is started by the microprocessor. RD − This signal indicates that the selected IO or memory device is to be read and is ready for accepting data available on the data bus. There are 3 control signal and 3 status signals. ![]() These signals are used to identify the nature of operation. Data busĪD7-AD0, it carries the least significant 8-bit address and data bus. The pins of a 8085 microprocessor can be classified into seven groups − Address busĪ15-A8, it carries the most significant 8-bits of memory/IO address. The following image depicts the pin diagram of 8085 Microprocessor − ![]()
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