interface 8255A objective master the principle and application of 8255A content basic input and output: program to set port A as input, port C as output, to move the data representing the switches status to the data light, i.e., the data light will change according to the switches status. program hint: (1). as shown in the following figure, Port C are connected to the switches KK0, port A are connected to LrL0, program to read the switches status from port C and then write the data to the port A to control the data lights. 2 program the 8255A as mode 0 , with port A as output and port C as intput, the address of port A and C are 288H and 28AH, respectively, the address of control word register is 28BH. . flow chart . program code interface 8255A objective master the principle and application of 8255A content basic input and output: program to set port A as input, port C as output, to move the data representing the switches status to the data light, i.e., the data light will change according to the switches status. program hint: (1). as shown in the following figure, Port C are connected to the switches KK0, port A are connected to LrL0, program to read the switches status from port C and then write the data to the port A to control the data lights. 2 program the 8255A as mode 0 , with port A as output and port C as intput, the address of port A and C are 288H and 28AH, respectively, the address of control word register is 28BH. . flow chart . program code