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SH7721 bảng dữ liệu(PDF) 340 Page - Renesas Technology Corp

tên linh kiện SH7721
Giải thích chi tiết về linh kiện  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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SH7721 bảng dữ liệu(HTML) 340 Page - Renesas Technology Corp

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Section 8
Interrupt Controller (INTC)
Rev. 3.00 Jan. 18, 2008 Page 278 of 1458
REJ09B0033-0300
8.5.2
Multiple Interrupts
When handling multiple interrupts, an interrupt handler should include the following procedures:
1. To determine the interrupt source, branch to a specific interrupt handler corresponding to a
code set in INTEVT or INTEVT2. The code in INTEVT or INTEVT2 can be used as an offset
for branching to the specific handler.
2. Clear the interrupt source 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 8.3 shows a sample interrupt operation
flowchart.



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