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MOTOROLA M68040 USER’S MANUAL 9- 7
they can be used to read the FPIAR in an exception handler without changing the
previous value. A reset or a restore operation of the null state clears the FPIAR.
9.3 FLOATING-POINT DATA FORMATS AND DATA TYPES
The M68000 floating-point model (MC68881, MC68882, MC68040) supports the following
data formats: single precision, double precision, extended precision, and packed decimal.
The M68000 floating-point model supports the following data types: normalized, zeros,
infinities, denormalized numbers, and NANs. The MC68040 supports part of the M68000
floating-point model in hardware. Table 9-2 lists the data formats and data types
supported by the MC68040. Tables 9-3 through 9-6 summarize the floating-point data
formats and data types details. For further information on the data formats and data types,
refer to the M68000UM/AD,
M68000 Family Programmer’s Reference Manual
.
Table 9-2. MC68040 FPU Data Formats and Data Types
Data Formats
Number
Types
Single-
Precision
Real
Double-
Precision
Real
Extended-
Precision
Real
Packed-
Decimal
Real
Byte
Integer
Word
Integer
Long -
Word
Integer
Normalized * * * † * * *
Zero * * * † * * *
Infinity * * * †
NAN * * * †
Denormalized † † †
Unnormalized † †
*Data Format/Type Supported by On-Chip MC68040 FPU Hardware
†Data Format/Type Supported by Software (MC68040FPSP)
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