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ST20C4 데이터시트(PDF) 94 Page - STMicroelectronics

부품명 ST20C4
상세설명  Instruction Set Reference Manual
PDF  212 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C4 데이터시트(HTML) 94 Page - STMicroelectronics

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iret
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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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