Floating Point Support
MVME197LEIG/D1
4-7
4
CPU/MPU Registers
MPU register CR20 is reserved for usage by the debugger. If CR20 is to be used
by the user program, it must be restored prior to utilizing debugger resources
(system calls).
Floating Point Support
The floating point Special Function Unit (SFU) of the MC88110 microprocessor
chip is supported in this version of 197Bug. For MVME197Bug, 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:
Integer Data Types
Floating Point Data Types
When entering data in single or double precision 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.
12
Byte
1234
Half-Word
123455678
Word
1_FF_7FFFFF
Single Precision Real Format
1_7FF_FFFFFFFFFFFFF
Double Precision Real Format
-3.123456789012123
Scientific Notation Format (decimal)
Solution Systems Technologies Inc.
720-565-5995 | [email protected] | www.solusys.com
Solution Systems Technologies Inc.
720-565-5995 | [email protected] | www.solusys.com
