BCD codes Express 10 digit(0-9): use 4 or more bits, many different way for coding Decimal digit BCD(8421) 8421 code 0000 0123 Natural code, just la ke 4-bit 0001 0010 binary numbers 0100 0101 Each digit is weighted 0110 6789 0111 It has 10 valid code words 000 1001 and 6 invalid code wordsBCD codes Express 10 digit ( 0—9) : use 4 or more bits, many different way for coding 8421 code Natural code , just lake 4-bit binary numbers; Each digit is weighted; It has 10 valid code words and 6 invalid code words