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ST20C2 Datasheet(PDF) 94 Page - STMicroelectronics |
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ST20C2 Datasheet(HTML) 94 Page - STMicroelectronics |
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94 / 212 page  iret ® 94/212 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: Secondar y instruction. |
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