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SH7708 Scheda tecnica(PDF) 137 Page - Renesas Technology Corp

Il numero della parte SH7708
Spiegazioni elettronici  SuperH??RISC engine
PDF  633 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7708 Scheda tecnica(HTML) 137 Page - Renesas Technology Corp

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6.4.2
Multiple Interrupts
When handling multiple interrupts, an interrupt handler should include the following procedures:
1. Branch to a specific interrupt handler corresponding to a code set in INTEVT. The code in
INTEVT can be used as a branch-offset for branching to the specific handler.
2. Clear the cause of the interrupt in each specific handler.
3. Save SSR and SPC to memory.
4. Clear the BL bit in SR, and set the accepted interrupt level in the interrupt mask bits in SR.
5. Handle the interrupt.
6. Execute the RTE instruction.
When these procedures are followed in order, an interrupt of higher priority than the one being
handled can be accepted after clearing BL in step 4. Figure 6.3 shows a sample interrupt operation
flowchart.



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