ST20CX 查看數據表（PDF） - STMicroelectronics

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ST20CX

Instruction Set Reference Manual

STMicroelectronics 

causeerror

causeerror

cause error

Code: 62 FF

Description: Take a trap with the trap type set to the value in Areg. Only one bit in

Areg should be set; the position of the bit indicates the trap to be signalled. When the

trap is taken the causeerror bit in the status register is set to indicate a user generated

trap.

In the case of a scheduler trap being set then the bottom bit of Breg is used to

determine the priority of the scheduler trap. In addition when the scheduler trap is

trapping a process scheduling operation (e.g. the run trap) the Breg is interpreted as

the process descriptor to be scheduled.

Definition:

if (Areg=2i) and (trap type i is enabled)

{

set causeerror bit in Status

cause trap type i

}

else

Undefined effect

Error signals: The causeerror bit is set and the indicated trap signalled if enabled.

Comments:

Secondary instruction.

Sets traps independently of trap enables state.

See also: tret sttraph ldtrap

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