AT697E datasheet(22/154 Pages) ATMEL

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AT697E

4226G–AERO–05/09

Traps Description

•

reset - A reset trap is caused by an external reset request. It causes the processor

to begin executing at virtual address 0. After a Reset Trap, no special memory

states are defined exept the PSR’s ‘et’ and ‘s’ bits that are initialized respectively ‘0’

and ‘1’.

•

write error - An error exception occurred on a data store to memory.

•

instruction_access_exception - A blocking error exception occurred on an

instruction access.

•

illegal_instruction - An attempt was made to execute an instruction with an

unimplemented opcode, or an UNIMP instruction, or an instruction that would result

in illegal processor state.

•

privileged_instruction - An attempt was made to execute a privileged instruction

while supervisor bit (s) in PSR is ‘0’ (not in supervisor mode).

•

fp_disabled - An attempt was made to execute an FPU instruction while FPU is not

enabled or not present.

•

cp_disabled - An attempt was made to execute a co-processor instruction while co-

processor is not enabled or not present.

•

watchpoint_detected - An instruction fetch memory address or load/store data

memory address matched the contents of a pre-loaded implementation-dependent

“watchpoint” register.

•

window_overflow - A SAVE instruction attempted to cause the current window

pointer (CWP) to point to an invalid window in the WIM.

•

window_underflow - A RESTORE or RETT instruction attempted to cause the

current window pointer (CWP) to point to an invalid window in the WIM.

•

register_hardware_error - An error exception occurred on a read only register

access.

A register file uncorrectable error was detected.

•

mem_address_not_aligned - A load/store instruction would have generated a

memory address that was not properly aligned according to the instruction, or a

JMPL or RETT instruction would have generated a non-word-aligned address.

•

fp_exception - An FPU instruction generated an IEEE_754_exception and its

corresponding trap enable mask (TEM) bit was 1, or the FPU instruction was

unimplemented, or the FPU instruction did not complete, or there was a sequence

or hardware error in the FPU. The type of floating-point exception is encoded in the

FSR’s ftt field.

•

data_access_exception - A blocking error exception occurred on a load/store data

access. EDAC uncorrectable error.

•

tag_overflow - A tagged arithmetic instruction was executed, and either arithmetic

overflow occurred or at least one of the tag bits of the operands was non zero.

•

trap_division_by_zero - An integer divide instruction attempted to divide by zero.

•

trap_instruction - A software instruction (Ticc) was executed and the trap condition

evaluated to true.

When multiple synchronous traps occur at the same cycle (i.e hardware errors), the

highest priority trap is taken, and lower priority traps are ignored.

AT697E Datasheet(PDF) 22 Page - ATMEL Corporation

AT697E Datasheet(HTML) 22 Page - ATMEL Corporation

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