Traditional Culture Encyclopedia - Traditional stories - Seeking microcomputer principle and microcontroller god! If the control word written to the 8255A is 83H, explain how its ports work?
Seeking microcomputer principle and microcontroller god! If the control word written to the 8255A is 83H, explain how its ports work?
First write 83H for 10000011, D7 bit for the flag bit, often 1, D6D5 to determine the mode of operation of the PA port (00 mode 0, 01 mode 1, 10 or 11 mode 2, D4 bit for the PA input and output control (1 for the input 0 for the output) D3 bit for the PCH input and output control, D2 bit for the mode of operation of the PB port (0 mode 0, 1 way 1)) D1 bit for PB input/output control, D0 bit for PCL input/output control
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