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HD6433637SW Datasheet(PDF) 87 Page - Renesas Technology Corp |
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HD6433637SW Datasheet(HTML) 87 Page - Renesas Technology Corp |
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87 / 418 page  73 PC and CCR saved to stack SP (R7) SP – 1 SP – 2 SP – 3 SP – 4 Stack area SP + 4 SP + 3 SP + 2 SP + 1 SP (R7) Even address Prior to start of interrupt exception handling After completion of interrupt exception handling Legend: PCH: PCL: CCR: SP: Upper 8 bits of program counter (PC) Lower 8 bits of program counter (PC) Condition code register Stack pointer * Ignored on return from interrupt. Notes: CCR CCR* PCH PCL 1. 2. PC shows the address of the first instruction to be executed upon return from the interrupt handling routine. Register contents must always be saved and restored by word access, starting from an even-numbered address. Figure 3.4 Stack State after Completion of Interrupt Exception Handling Figure 3.5 shows a typical interrupt sequence where the program area is in the on-chip ROM and the stack area is in the on-chip RAM. |
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