AVR32AP datasheet(45/181 Pages) ATMEL

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32001A–AVR32–06/06

AVR32

3.11.1.26

Floating-point Exception

The Floating-point exception is generated when the optional Floating-Point Hardware signals

that an IEEE

® exception occurred, or when another type of error from the floating-point hardware

occurred. Unused in AVR32 AP since it has no FP hardware.

RSR_EX = SR;

RAR_EX = PC;

SR[R] = 0;

SR[J] = 0;

SR[M2:M0] = B’110;

SR[EM] = 1;

SR[GM] = 1;

PC = EVBA | 0x2C;

3.11.1.27

Coprocessor Exception

The Coprocessor exception occurs when the addressed coprocessor does not acknowledge an

instruction. This permits software implementation of coprocessors.

RSR_EX = SR;

RAR_EX = PC;

SR[R] = 0;

SR[J] = 0;

SR[M2:M0] = B’110;

SR[EM] = 1;

SR[GM] = 1;

PC = EVBA | 0x30;

3.11.1.28

Supervisor call

Supervisor calls are signalled by the application code executing a supervisor call (scall) instruc-

tion. The scall instruction behaves differently depending on which context it is called from. This

allows scall to be called from other contexts than Application.

When the exception routine is finished, execution continues at the instruction following scall. The

rets instruction is used to return from supervisor calls.

If ( SR[M2:M0] == {B’000 or B’001} )

RAR_SUP

← PC + 2;

RSR_SUP

← SR;

← EVBA | 0x100;

SR[M2:M0]

← B’001;

else

Current Context

← PC + 2;

← EVBA | 0x100;

AVR32AP Fiches technique(PDF) 45 Page - ATMEL Corporation

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