PROGRAM NO.8
OBJECT:Write a program to read 8-bit data from port B. Complement this data & send it back to port A of IC8255-PPI in mode-0.
Control word- 83H
Port Address of Control Register- FFFE
Port Address of Port A- FFF8
Port Address of Port B- FFFA
INSTRUMENT REQUIRED: 8086 Microprocessor Trainer Kit.
PROGRAM:
| MEMORY LOCATION | MACHINE CODE | OPCODE | OPERAND |
| 0200 | BA FE FF | MOV | DX,FFFE |
| 0203 | B083 | MOV | AL,83H |
| 0205 | EE | OUT | DX,AL |
| 0206 | BA FA FF | LOOP1: MOV | DX,FFFA |
| 0209 | EC | IN | AL,DX |
| 020A | F6 D0 | NOT | AL |
| 020C | BA F8 FF | MOV | DX,FFF8 |
| 020F | EE | OUT | DX,AL |
| 0210 | 75 F4 | JMP LOOP1 | |
| 0212 | F4 | HLT |
DESCRIPTION:
To solve the given objective we have taken a Control Word to control the input.
83H is the memory location where the control word i.e. Input is placed or stored. Control word has a program which is used to make the Microprocessor Unit(MPU) understand the Input. Logic Controller Interface Card is used when we do not want to use 7-segment LED display.
To solve the given objective we have taken the following steps:
BIT PATTERN FOR CONTROL WORD
| D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 |
| 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
- Move the data register (DX) to the memory location where the Control word i.e. 83H is stored, i.e. at FFFE.
- Move the control word 83H to the AL register.
- Complement the data of port B i.e. FFFA using NOT instruction and sent it back to port A i.e. FFF8 using a loop to JMP at port A.
- And finally Halt, the program.
INPUT:
| MEMORY LOCATION | VALUE |
| FFF8 (Address of Port A) | 00 |
| FFFA (Address of Port B) | 03 |
| FFFE (Address of Control Register) | 83 |
OUTPUT:
| MEMORY LOCATION | VALUE |
| FFF8 (Address of Port A) | FC |
| FFFA (Address of Port B) | 03 |
| FFFE (Address of Control Register) | 83 |
RESULT: The complemented data from port address FFFA i.e. Port B has been transferred to port address FFF8 i.e. Port A using IC8255-PPI in mode-0.
FLOWCHART:
Microprocessor Lab Manual
Most Important Question for Exam
1. Primary function of memory is that the ______ should be able to rad from and write into register
Microprocessor
2. To perfoarm any operations the Mp should identify the__________
Register
3. The Microprocessor places__________address on the address bus
16 bit
4. The Microprocessor places 16 bit address on the add lines from the address by__________register should be selected
One
5. The _________of memory chip will identify and select the register for the EPROM
Internal Decoder
6. Microprocessor provides signal like ______to indicate the read operation
MCMR
7. To interface memory with the Microprocesor connect registe the lines of the address bus must be added to address lines of the _______chip.
Memory
8. The remaining address line of ______bus is decoded to generate chip select signal
Address
9. _______signal is generate by combie RD and WR with IO/M.
Control
10. Memory is an integrated part of a __________ system
Micro Computer
11. __________has certain signal requirements write into read from its registers
Memory
12. The primary function of the________is to accept data from I/P devices
Microprocessor
13. _________signal prevent the microprocessor from reading the same data more than one
Handshaking
14. Bits in IRR interrupt are________
Set
15. ________general interrupt signal to microprocessor and receive acknowledge
Control Logic
16. The _____ pin is used to select direct command word
A0
17. The_______is used to connect more Microprocessor
Cascade
18. CS connect the output of ___________
Decoder
19. In which year 8086 introduced?
1978
20. Explain for HMOS technology____________
High performance metal oxide semiconductor
21. 8086 and 8088 contains__________transistor
29000
22. What is DEN?
Deta Enable
23. In 8086 the overflow flag is set when___________
Signed numbers go out of their range after an arithmetic operation
24. In 8086 Microprocessor one of the following statement is not true?
Coprocessor is interfaced in min mode
25. Access time is faster for__________
SRAM
26. Which of the following is not a basic element within the Microprocosser?
Microcontrolle
27. Which method bypass the CPU for certain types of data transfer?
Direct memory access(DMA)
28. Which is not an operand?
Assembler
29. A 20 bit address bus can locate_________
1,048,576 locations
30. Which of the following is not an arithmetic insturction?
ROL (rotate left)
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