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Floating Point Instructions
5-146 M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL MOTOROLA
FTRAPcc Trap on Floating-Point Condition FTRAPcc
(MC6888X, MC68040)
Instruction Format:
Instruction Fields:
Mode field—Specifies the form of the instruction.
010 The instruction is followed by a word operand.
011 The instruction is followed by a long-word operand.
100 The instruction has no operand.
Conditional Predicate field—Specifies one of 32 conditional tests as described in 3.6.2
Conditional Testing.
Operand field—Contains an optional word or long-word operand that is user defined.
NOTE
When a BSUN exception occurs, a preinstruction exception is
taken by the main processor. If the exception handler returns
without modifying the image of the program counter on the stack
frame (to point to the instruction following the FTRAPcc), it must
clear the cause of the exception (by clearing the NAN bit or dis-
abling the BSUN trap), or the exception occurs again immediate-
ly upon return to the routine that caused the exception.
1514131211109876543210
1111
COPROCESSOR
ID
001111 MODE
0000000000 CONDITIONAL PREDICATE
16-BIT OPERAND OR MOST SIGNIFICANT WORD OF 32-BIT OPERAND (IFNEEDED)
LEAST SIGNIFICANT WORD OR 32-BIT OPERAND (IF NEEDED)
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