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Commands - 8

BCD

Numeric Fun ction

SYNTAX: n = BCD(m)

PURPOSE: To return four digits in packed BCD format from a number.

REMARK S: The four BCD digits are stor ed in the variable n. Each BC D digit is 4– bits and the four BCD d igits

are stored in 16– bit form . T hese are known as packed BC D num bers. One com mon use is to

convert a count to BCD to send to displays that have BCD inputs.

RELATED: BIN

EXAMPLE: A = 456

PRINT BCD(A)

1110

At first, the answer above appears to be wrong. This is due to the fact that the 4– digit BCD

number has been packed into 16– bits and the print command is treating it as a binary number.

The following converts a 4– digit number and outputs it to two ports:

10 N = BCD(6789)

20 M = N AND 255

30 OUT 1,M

40 N = N \ 256

50 OUT 2,N

ERROR: < Illegal argument> – if m > 9999

< Data negative > – for m

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Remote-processing CAMBASIC Manuale Utente Pagina 41