Книга: Advanced PIC Microcontroller Projects in C

1.23 BCD Numbers

1.23 BCD Numbers

BCD (binary coded decimal) numbers are usually used in display systems such as LCDs and 7-segment displays to show numeric values. In BCD, each digit is a 4-bit number from 0 to 9. As an example, Table 1.4 shows the BCD numbers between 0 and 20.

Table 1.4: BCD numbers between 0 and 20

Write the decimal number 295 as a BCD number.

Write the 4-bit binary equivalent of each digit:

2 = 00102 9 = 10012 5 = 01012

The BCD number is 0010 1001 0101₂.

Write the decimal equivalent of BCD number 1001 1001 0110 0001₂.

Writing the decimal equivalent of each group of 4-bit yields the decimal number: 9961

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