![]() ![]() The function of the keyboard section is to interface the keyboard which is used as input device for the microprocessor. Data input and display are the integral part of microprocessor kits and microprocessor-based systems.Ĩ279 has been designed for the purpose of 8-bit Intel microprocessors.Ĩ279 has two sections namely keyboard section and display section. The Intel 8279 is a programmable keyboard interfacing device. For this type of interfacing, we use latches and buffers for interfacing the keyboards and displays with the microprocessor.īut the main drawback of this interfacing is that the microprocessor can perform only one function. Therefore, it is necessary that we interface keyboard and displays with the microprocessor. I/O interfacingĪs we know, keyboard and displays are used as communication channel with outside world. Therefore, the interfacing circuit should be designed in such a way that it matches the memory signal requirements with the microprocessor's signals. The interfacing process includes matching the memory requirements with the microprocessor signals. Memory requires some signals to read from and write to registers and microprocessor transmits some signals for reading or writing data. ![]() The corresponding memory chip or I/O device is selected by a decoding circuit. When we are executing any instruction, the address of memory location or an I/O device is sent out by the microprocessor. The following figure shows a schematic diagram to interface memory chips and I/O devices to a microprocessor. Several memory chips and I/O devices are connected to a microprocessor. ![]()
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