The language needed is assembly language 8086
2) The following questions are set up in view of the figures (a,b). a) Describe what type of I/O operation is carried out in Figure (a). Write an instruction sequence that will input the byte contents of input port 6 to memory location MEMI. b) What is the polling operation? Write a sequence of instructions to poll the input 17 at input port 5 to check whether it is switched to zero or not. Figure (a). c) Write a sequence of instructions that will read the contents of input port 7. Mask off all the bits except LSB. The content of LSB will be shifted to CF. If CF =1, then the program will go to start of service routine XXX. Figure (a). d) Describe what type of I/O operation is carried out in Figure (b). Write a sequence of instructions to initialize the control register in PPI 0 in Figure (b) so that PA is an output port, PB and Pc are input ports. Initialize all the necessary registers. Ports are configured for mode 0 operation. e) Write a program to input the contents of PB and Pc then OR them together and send the resultant to PA. These ports are the PPI O ports in Figure (b). Ports are configured for mode 0 operation. Initialize all the necessary registers. Write comments and Use minimum number of instructions in your programs. ALE 356 Au-A AD, AD). A A CLK 74F373 123 Address Latch OE . . CBA 74F138 Input output Gaddress decoder G 74F244 Porto A 10/M SORS MPU Do AD, AD, D.-D. 74245 Data bus transceiver DIR DT/R 74F244 Port 1 DEN G RD 74F244 Port Figure (a) Figure 7.12 Sixty-four-line input circuit for an 8088 microcomputer Control bus Address bus A -A Data bus Do-D A A As A 74138 G To other even address peripheral 10/M A: G 0. CS Port A Do-D Do-D; A, 8256A Port C A RD RD WR Port B WR Figure 7.27 Memory-mapped 8255A DO ports in an 8088 microcomputer Figure (b) 2) The following questions are set up in view of the figures (a,b). a) Describe what type of I/O operation is carried out in Figure (a). Write an instruction sequence that will input the byte contents of input port 6 to memory location MEMI. b) What is the polling operation? Write a sequence of instructions to poll the input 17 at input port 5 to check whether it is switched to zero or not. Figure (a). c) Write a sequence of instructions that will read the contents of input port 7. Mask off all the bits except LSB. The content of LSB will be shifted to CF. If CF =1, then the program will go to start of service routine XXX. Figure (a). d) Describe what type of I/O operation is carried out in Figure (b). Write a sequence of instructions to initialize the control register in PPI 0 in Figure (b) so that PA is an output port, PB and Pc are input ports. Initialize all the necessary registers. Ports are configured for mode 0 operation. e) Write a program to input the contents of PB and Pc then OR them together and send the resultant to PA. These ports are the PPI O ports in Figure (b). Ports are configured for mode 0 operation. Initialize all the necessary registers. Write comments and Use minimum number of instructions in your programs. ALE 356 Au-A AD, AD). A A CLK 74F373 123 Address Latch OE . . CBA 74F138 Input output Gaddress decoder G 74F244 Porto A 10/M SORS MPU Do AD, AD, D.-D. 74245 Data bus transceiver DIR DT/R 74F244 Port 1 DEN G RD 74F244 Port Figure (a) Figure 7.12 Sixty-four-line input circuit for an 8088 microcomputer Control bus Address bus A -A Data bus Do-D A A As A 74138 G To other even address peripheral 10/M A: G 0. CS Port A Do-D Do-D; A, 8256A Port C A RD RD WR Port B WR Figure 7.27 Memory-mapped 8255A DO ports in an 8088 microcomputer Figure (b)
