The question asks for the number of bytes used by the $DATA_1 DB "INDIA"$ directive in the 8051 microcontroller.

Understanding the 8051 DB Directive

The $DB$ directive in 8051 assembly language stands for "Define Byte". It is used to allocate memory space and initialize it with byte-sized data.

Analyzing the Data Directive

• The directive is specified as: $DATA_1 DB "INDIA"$
• $DATA_1$ is the label for the memory location.
• $DB$ indicates that the following data should be stored as bytes.
• The data provided is the string $"INDIA"$.

Calculating Bytes Used

Each character within the string literal requires one byte of storage. The string "INDIA" contains the following 5 characters:

• 'I'
• 'N'
• 'D'
• 'I'
• 'A'

Therefore, the total number of bytes used by this directive is the count of characters in the string, which is 5.

Conclusion

The $DATA_1 DB "INDIA"$ directive reserves 5 bytes in memory to store the string "INDIA".