DCB

Define constant byte.

[ label] DCBarg[,arg,...,arg]

The DCB directive allocates and initializes a byte of memory for each arg argument. The arg may be a byte integer constant, a single- or multiple-character string constant, a symbol, or a byte expression. The DCB directive may have one or more arguments separated by commas. Multiple arguments are stored in successive byte locations. If multiple arguments are present, one or more of them can be null (two adjacent commas), in which case the corresponding byte location is filled with zeros.

If label is present, it is assigned the value of the runtime location counter at the start of the directive processing.

Integer arguments are stored as is, but must be byte values (e.g. within the range 0-255); floating-point numbers are not allowed. Single- and multiple-character strings are handled in the following manner:

• Single-character strings are stored in a word whose lower seven bits represent the ASCII value of the character.
• Multiple-character strings represent words whose bytes are composed of concatenated sequences of the ASCII representation of the characters in the string (unless the NOPS option is specified; see the OPT directive). If the number of characters is not an even multiple of the number of bytes per DSP word, then the last word has the remaining characters left-aligned and the rest of the word is zero-filled. If the NOPS option is given, each character in the string is stored in a word whose lower seven bits represent the ASCII value of the character.

TABLE DCB 'two',0,'strings',0

CHARS DCB 'A','B','C','D'

BSC

DC