Generation of Control Signals of 8085
Generation of Control Signals In any system, there are different modes of operations. Likewise, in some situation we are interested to read data in microprocessor, in other we are interested to write data on some location from microprocessor. Whenever, we are dealing with different peripherals using 8085 microprocessor there are two modes of operations. One is to read data from any of the memory device or input device. Second is to write data on some location, this location can be any of the output device location or any of the memory location. To deal with these modes 8085 microprocessor architecture gives three different control signals. Namely IO/ M , RD and WR . The IO/ M is an output pin of the 8085 microprocessor which serves dual purpose, the high going pulse on this pin indicates the I/O type of operation. We can state that, at this time 8085 is working with the input or output devices. The low going pulse on this pin indicates the memory oper...