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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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H8/300H Datasheet(PDF) 77 Page - Renesas Technology Corp |
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H8/300H Datasheet(HTML) 77 Page - Renesas Technology Corp |
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77 / 552 page  Section 3 Exception Handling Rev. 3.00 May 15, 2007 Page 45 of 516 REJ09B0152-0300 Vector fetch φ Internal address bus Internal read signal Internal write signal Internal data bus (16 bits) RES Internal processing Initial program instruction prefetch (1) Reset exception handling vector address (H'0000) (2) Program start address (3) Initial program instruction (2) (3) (2) (1) Reset cleared Figure 3.1 Reset Exception Handling Sequence 3.2.2 Interrupt Immediately after Reset Immediately after a reset, if an interrupt is accepted before the stack pointer (SP) is initialized, PC and CCR will 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.L #xx: 32, SP). |
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