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HD404369F データシート(PDF) 18 Page - Renesas Technology Corp |
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HD404369F データシート(HTML) 18 Page - Renesas Technology Corp |
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18 / 117 page  HD404369 Series 16 An interrupt request occurs when the IF is set to 1 and the IM is set to 0. If the IE is 1 at that point, the interrupt is processed. A priority programmable logic array (PLA) generates the vector address assigned to that interrupt source. The interrupt processing sequence is shown in figure 9 and an interrupt processing flowchart is shown in figure 10. After an interrupt is acknowledged, the previous instruction is completed in the first cycle. The IE is reset in the second cycle, the carry, status, and program counter values are pushed onto the stack during the second and third cycles, and the program jumps to the vector address to execute the instruction in the third cycle. Program the JMPL instruction at each vector address, to branch the program to the start address of the interrupt program, and reset the IF by a software instruction within the interrupt program. |
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