Description: 8255: (1) basic input-output experiment: The experimental work in the 8255 Port A as input port mode 0, port B operate in mode 0 and as output. Switching signal with a set of access ports A, B port output line connected to a set of data light, and then program the chip by 8255 to achieve the input and output functions. (2) water lights display program, from d7 to d0, d8 to d15 light from the light 8251 at the same time in order: (1) serial transmission of data signals sent to the serial port to serial format data from the TXD pin, programming to observe the serial output format. (2) Since the income from the collection by the spontaneous self-test experiments to verify the hardware and software machine design, commonly used in self-test.
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