Motorola 700 Series, Installation And Use Manual

Page: 115 / 156

Floating Point Support
4-19
4
4. The sign field, the exponent field, and at least the first digit of
the mantissa field must be present (any unspecified digits in
the mantissa field are set to zero).
5. Each field must be separated from adjacent fields by an
underscore.
6. All the digit positions in the sign and exponent fields must be
present.
Single Precision Real
This format would appear in memory as:
A single precision number takes 4 bytes in memory.
Double Precision Real
This format would appear in memory as:
A double precision number takes 8 bytes in memory.
Note
The single and double precision formats have an
implied integer bit (always 1).
1-bit sign field (1 binary digit)
8-bit biased exponent field (2 hex digits. Bias = $7F)
23-bit fraction field (6 hex digits)
1-bit sign field (1 binary digit)
11-bit biased exponent field (3 hex digits. Bias = $3FF)
52-bit fraction field (13 hex digits)