ST20CX View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST20CX

Instruction Set Reference Manual

STMicroelectronics 

iret

iret

interrupt return

Code: 61 FF

Description: Return from external interrupt. Signal iret to interrupt handler and return

to the context of the interrupted process and resume execution. The interrupted high

priority state is recovered from the workspace – if this does not contain a running

process the processor switches to the interrupted low priority state held in the shadow

registers.

Definition:

Status′ ← word[Wptr]

if (Status has valid bit set)

{

Wptr′ ← word[Wptr + 1]

Iptr′ ← word[Wptr + 2]

Areg′ ← word[Wptr + 3]

Breg′ ← word[Wptr + 4]

Creg′ ← word[Wptr + 5]

}

else

Return to interrupted low priority state

Error signals: none

Comments:

Secondary instruction.

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