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Re: [avr-gcc-list] BCD and packed BCD

From: Randy Ott
Subject: Re: [avr-gcc-list] BCD and packed BCD
Date: Wed, 29 May 2002 16:34:29 -0500


BCD or 'binary coded decimal' is just a representation of decimal digits
from 0 to 9 in binary.  Since it only takes 4 bits to represent 0 to 9, you
can fit two digits in a byte.  This is called packed BCD.

For example, the number 99 can be represented as 10011001, this looks like
0x99 in hex.  Precision decimal math can be done easily with BCD and it
makes conversion to ASCII characters very easy.

Randy Ott

----- Original Message -----
From: "Brandon Tolbert" <address@hidden>
To: "AVR List" <address@hidden>
Sent: Wednesday, May 29, 2002 2:05 PM
Subject: [avr-gcc-list] BCD and packed BCD

Does anyone know the difference between bcd and packed bcd?

avr-gcc-list at http://avr1.org

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