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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M306V2EEFS датащи(PDF) 60 Page - Renesas Technology Corp |
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M306V2EEFS датащи(HTML) 60 Page - Renesas Technology Corp |
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60 / 271 page  Rev.1.40 Oct 06, 2004 page 60 of 269 M306V2ME-XXXFP, M306V2EEFP The operation of saving registers carried out in the interrupt sequence is dependent on whether the content of the stack pointer, at the time of acceptance of an interrupt request, is even or odd. If the content of the stack pointer (Note) is even, the content of the flag register (FLG) and the content of the program counter (PC) are saved, 16 bits at a time. If odd, their contents are saved in two steps, 8 bits at a time. Figure 2.7.7 shows the operation of the saving registers. Note: Stack pointer indicated by U flag. Figure 2.7.7 Operation of saving registers (2) Stack pointer (SP) contains odd number [SP] (Odd) [SP] – 1 (Even) [SP] – 2(Odd) [SP] – 3 (Even) [SP] – 4(Odd) [SP] – 5 (Even) Address Sequence in which order registers are saved (2) (1) Finished saving registers in four operations. (3) (4) (1) Stack pointer (SP) contains even number [SP] (Even) [SP] – 1(Odd) [SP] – 2 (Even) [SP] – 3(Odd) [SP] – 4 (Even) [SP] – 5 (Odd) Note: [SP] denotes the initial value of the stack pointer (SP) when interrupt request is acknowledged. After registers are saved, the SP content is [SP] minus 4. Address Program counter (PCM) Stack area Flag register (FLGL) Program counter (PCL) Sequence in which order registers are saved (2) Saved simultaneously, all 16 bits (1) Saved simultaneously, all 16 bits Finished saving registers in two operations. Program counter (PCM) Stack area Flag register (FLGL) Program counter (PCL) Saved simultaneously, all 8 bits Flag register (FLGH) Program counter (PCH) Flag register (FLGH) Program counter (PCH) |
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