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HD6433635SW Datasheet(PDF) 72 Page - Renesas Technology Corp |
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HD6433635SW Datasheet(HTML) 72 Page - Renesas Technology Corp |
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72 / 418 page  58 • The PC is loaded from the reset exception handling vector address (H'0000 to H'0001), after which the program starts executing from the address indicated in PC. When system power is turned on or off, the RES pin should be held low. Figure 3.1 shows the reset sequence. Vector fetch ø Internal address bus Internal read signal Internal write signal Internal data bus (16-bit) RES Internal processing Program initial instruction prefetch (1) Reset exception handling vector address (H'0000) (2) Program start address (3) First instruction of program (2) (3) (2) Reset cleared (1) Figure 3.1 Reset Sequence 3.2.3 Interrupt Immediately after Reset After a reset, if an interrupt were to be accepted before the stack pointer (SP: R7) was initialized, PC and CCR would not be pushed onto the stack correctly, resulting in program runaway. To prevent this, immediately after reset exception handling all interrupts are masked. For this reason, the initial program instruction is always executed immediately after a reset. This instruction should initialize the stack pointer (e.g. MOV.W #xx: 16, SP). |
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