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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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H838532H датащи(PDF) 80 Page - Renesas Technology Corp |
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H838532H датащи(HTML) 80 Page - Renesas Technology Corp |
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80 / 508 page  Section 3 Exception Handling Rev. 1.00 May 30, 2008 Page 60 of 484 REJ09B0436-0100 When system power is turned on or off, the RES pin should be held low. Figure 3.1 shows the reset sequence starting from RES input. Vector fetch φ 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) (1) Reset cleared 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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