PROGRAM NO.10
OBJECT:Write a program to find Gray Code Equivalent of a binary number using Lookup Table.
INSTRUMENT REQUIRED: 8086 Microprocessor Trainer Kit.
PROGRAM:
| MEMORY LOCATION | MACHINE CODE | OPCODE | OPERAND |
| 0202 | BB 00 03 | MOV | BX,0300H |
| 0205 | BE 00 02 | MOV | SI,0200H |
| 0208 | AC | LOD SB | |
| 0209 | D7 | XLAT | |
| 020A | 88 04 | MOV | [SI],AL |
| 020C | F4 | HLT |
DESCRIPTION:
To solve the given objective we have taken a binary number (its hexadecimal equivalent) in the memory location 0200H and left the memory location of 0201H and 0201H empty with 00. Then we have taken a lookup table to check for the gray code equivalent of the input binary number. The lookup table being stored from memory location of 0300H to 030FH.
To solve the given objective we have taken the following steps:
- Move the first gray code number from the lookup table into the BX registe
- Move the source index (SI) pointer to point to the memory location of the input binary number (its hexadecimal equivalent).
- Then the string byte is loaded from the lookup table and translated from gray to binary number.
- Move the source index pointer to point to the memory location where the gray equivalent number is to be stored, i.e. AL.
INPUT:
| LOCATION | SPECIFICATION | VALUE STORED |
| 0200H 0201H | NUMBER INPUT(BINARY)) NUMBER OUTPUT(GRAY CODE) | 0A 00 |
LOOKUP TABLE:-
| MEMORY LOCATION | VALUE |
| 0300H | 00 |
| 0301H | 01 |
| 0302H | 03 |
| 0303H | 02 |
| 0304H | 06 |
| 0305H | 07 |
| 0306H | 05 |
| 0307H | 04 |
| 0308H | 0C |
| 0309H | 0D |
| 030AH | 0F |
| 030BH | 0E |
| 030CH | 0A |
| 030DH | 0B |
| 030EH | 09 |
| 030FH | 08 |
INPUT BINARY CODE VALUE:
| MEMORY LOCATION | VALUE |
| 0200H | 0A |
| 0201H | 00 |
OUTPUT:
| MEMORY LOCATION | VALUE |
| 0201H | 0F |
RESULT: The gray code equivalent of the binary number is checked from the lookup table and stored at the output.
FLOWCHART:
Most Important Question for Exam
1. Synchronization bit at the beginning of character is called ________.
start bit
2. Which is a 8 bit Microprocessor ?
Motorala MC-6801
3. The First electronic computer was completed in __________.
1946
4. What is the microprocessor comprises:
All of these
5. Customized ROMS are called
Mask ROM
6. Each memory location has
Both a and b
7. Which of the following memory medium is not used as main memory system?
Magnetic tape
8. One of the main feature that distinguish microprocessors from micro-computers is
Microprocessor does not contain I/O devices
9. An integrated circuit is
Fabricated on a tiny silicon chip
10. Most important advantage of an IC is its
Extremely high reliability
11. Which of the following items are examples of storage devices?
All of the these
12. Before a disk can be used to store data. It must be…….
Formatted
13. What are the three decisions making operations performed by the ALU of a computer?
All of the these
14. What is the responsibility of the logical unit in the CPU of a computer?
To compare numbers
15. The secondary storage devices can only store data but they cannot perform
Either of the these
16. Which of the following memories allows simultaneous read and write operations?
RAM
17. A 32 bit microprocessor has the word length equal to
4 byte
18. The instructions for starting the computer are house on
Read only memory chip
19. The ALU of a computer normally contains a number of high speed storage element called
Registers
20. Which of the following terms is the most closely related to main memory?
Temporary
21. In which form CPU provide output:
Digital signals
22. A nibble can be represented in the from of:
Hexadecimal
23. Pseudo instructions are basically
assembler directives
24. EPROM is generally erased by using
Ultraviolet rays
25. Signal voltage ranges for a logic high and for a logic low in RS-232C standard are
Low =-15 volt to –3 vol, high = +3 volt to +15 volt
26. The first modern computer was called_____________
ENIAC
27. The first task of DOS operating system after loading into the memory is to use the file
called___________
CONFIG.SYS
28. A microprocessor without the interrupt facility
is not useful for process control system
29. The multiplexing of address bus and data buses are used in microprocessor
to reduce the number of pins
30. A bus connected between the CPU and main memory that permits transfer of information between main memory and the CPU is known as
Memory bus
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