Motorola MVME162 manual Floating Point Support, Integer Data Types, Floating Point Data Types

Floating Point Support

Floating Point Support

The floating point unit (FPU) of the MC68040 microprocessor chip is supported in 162Bug. For MVME162Bug, the commands MD, MM, RM, and RS have been extended to allow display and modification of floating point data in registers and in memory. Floating point instructions can be assembled/disassembled with the DI option of the MD and MM commands.

Valid data types that can be used when modifying a floating point data register or a floating point memory location:

4

Integer Data Types

12Byte

1234Word

12345678 Longword

Floating Point Data Types

1_FF_7FFFFF	Single Precision Real Format
1_7FF_FFFFFFFFFFFFF	Double Precision Real Format
1_7FFF_FFFFFFFFFFFFFFFF	Extended Precision Real Format
1111_2103_123456789ABCDEF01	Packed Decimal Real Format
-3.12345678901234501_E+123	Scientific Notation Format (decimal)

When entering data in single, double, extended precision, or packed decimal format, the following rules must be observed:

1.The sign field is the first field and is a binary field.

2.The exponent field is the second field and is a hexadecimal field.

3.The mantissa field is the last field and is a hexadecimal field.

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.

MVME162IG/D2 4-17