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MC68060 Instructions
D-16 M68060 USER’S MANUAL MOTOROLA
FSAVE Save Internal Floating-Point State FSAVE
(MC68060 only)
Operation: If in Supervisor State
Then FPU Internal State State Frame
Else TRAP
Assembler
Syntax: FSAVE<ea>
Attributes: Unsized
Description: FSAVE allows the completion of any floating-point operation in progress. It
saves the internal state of the floating-point unit in a state frame located at the effective
address. After the save operation, the floating-point unit is in the idle state, waiting for
the execution of the next instruction. The first long word written to the state frame con-
tains the frame format on the third byte. The state frame always contains three long
words.
Any floating-point operation in progress when an FSAVE instruction is encountered
can be completed before the FSAVE executes, saving an IDLE state frame. An IDLE
state frame is created by the FSAVE if no exceptions occurred; otherwise, an EXCP
state frame is created.
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