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GMS81032 Datasheet(PDF) 71 Page - Hynix Semiconductor |
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GMS81032 Datasheet(HTML) 71 Page - Hynix Semiconductor |
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71 / 101 page  5 - 6 5.4 INTERRUPT PROCESSING SEQUENCE When an interrupt is accepted, the on-going process is stopped and the interrupt service routine is executed. After the interrupt service routine is completed it is necessary to restore everything to the state before the interrupt occured. As soon as an interrupt is accepted, the content of the program counter and PSW are saved in the stack area. At the same time, the content of the vector address corresponding to the accepted interrupt, which is in the interrupt vector table, enters into the program counter and interrupt service is executed. In order to execute the interrupt service routine, it is necessary to write the jump addresses in the vector table (FFEOH-FFFFH) corresponding to each interrupt Interrupt Processing Step 1) Store upper byte of Program Counter, SP ¡ç SP 2) Store lower byte of Program Counter, SP ¡ç SP - 1 3) Store Program Status Word, SP ¡ç SP - 2 4) After resetting of I-flag, clear accepted Interrupt Request Flag.(Set B-flag for BRK Instruction) 5) Call Interrupt service routine Chapter 5. Interrupt |
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