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Registered Member #177
Joined: Wed Feb 15 2006, 02:16PM
Location: Munich, Germany
Posts: 214
Hi,
I want to display a 8Bit binary number as 3digit decimal number with 3 LED displays. The main problem I encounter now, is that most decoders only accept 0-9 bcd or hexadecimal input.
That means for example, that a decimal "20" in binary will be 0001 0100 whcih I cant feed into de decoder.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
The old-fashioned way to do that is with a PROM containing a lookup table. The table has 256 entries that say which number to display on each of the three displays. Since it takes 4 bits to specify what each display shows, you need a PROM with 256 12-bit locations, and three decoder chips. If you put on your propeller hat for a minute, you can probably imagine how to multiplex a single decoder chip amongst three displays, and at the same time do away with the need for a 12-bit-wide memory.
The easiest way to do it nowadays is with a PIC or similar cheap microcontroller chip programmed with a binary-to-BCD conversion routine. You don't need to write the routine yourself: the manufacturer of the chip should provide a library (although it is a good exercise to try doing it yourself)
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8Bit binary to 12Bit BCD
