mc68ec040v Freescale Semiconductor, Inc, mc68ec040v Datasheet - Page 251

• Manufacturer Part Number: mc68ec040v
• Description: M68040 User Manual
• Manufacturer: Freescale Semiconductor, Inc

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 .
MOTOROLA
*Data Format/Type Supported by On-Chip MC68040 FPU Hardware
†Data Format/Type Supported by Software (MC68040FPSP)
Normalized
Zero
Infinity
NAN
Denormalized
Unnormalized
Number
Types
Table 9-2. MC68040 FPU Data Formats and Data Types
Precision
Single-
Real
*
*
*
*
†
Freescale Semiconductor, Inc.
For More Information On This Product,
Precision
Double-
Real
*
*
*
*
†
Go to: www.freescale.com
M68040 USER’S MANUAL
Extended-
Precision
Real
*
*
*
*
†
†
Data Formats
Packed-
Decimal
Real
†
†
†
†
†
†
Integer
Byte
*
*
Integer
Word
*
*
Integer
Long -
Word
*
*
9- 7