TS68040 ATMEL Corporation, TS68040 Datasheet - Page 26

• Manufacturer Part Number: TS68040
• Description: 32-bit Mpu, 25-33 MHZ
• Manufacturer: ATMEL Corporation

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6.2 - Data types and addressing modes
The TS 68040 supports the basic data types shown in Table 18. Some data types apply only to the integer unit, some only
to the FPU, and some to both the integer unit and the FPU. In addition, the instruction set supports operations on other
data types such as memory addresses.
Table 18 - Data types
The three integer data formats that are common to both the integer unit and the FPU (byte, word, and long word) are the
standard twos-complement data formats defined in the TS 68000 Family architecture. Whenever an integer is used in a
floating-point operation, the integer is automatically converted by the FPU to an extended-precision floating-point number
before being used. The ability to effectively use integers in floating-point operations saves user memory because an integer
representation of a number usually requires fewer bits than the equivalent floating-point representation.
Bit
Bit field
BCD
Byte integer
Word integer
Long-word integer
Quad-word integer
16 byte
Single-precision real
Double-precision real
Extended-precision real
* IU = Integer unit.
Operand data type
1-32 bits
128 bits
32 bits
16 bits
32 bits
64 bits
32 bits
64 bits
80 bits
8 bits
1 bit
Size
Figure 20 : Programming model.
Execution unit
(IU*, FPU)
IU, FPU
IU, FPU
IU, FPU
FPU
FPU
FPU
IU
IU
IU
IU
IU
Field of consecutive bits
Packaged : 2 digits byte
Unpacked : 1 digit byte
Any two data registers
Memory-only, aligned 16-byte boundary
1-bit sign, 8-bit exponent, 23-bit mantissa
1-bit sign, 11-bit exponent, 52-bit mantissa
1-bit sign, 15-bit exponent, 64-bit mantissa
Notes