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M306V2EEFS bảng dữ liệu(PDF) 59 Page - Renesas Technology Corp |
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M306V2EEFS bảng dữ liệu(HTML) 59 Page - Renesas Technology Corp |
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59 / 271 page  Rev.1.40 Oct 06, 2004 page 59 of 269 M306V2ME-XXXFP, M306V2EEFP 2.7.13 Saving Registers In the interrupt sequence, only the contents of the flag register (FLG) and that of the program counter (PC) are saved in the stack area. First, the processor saves the four higher-order bits of the program counter, and 4 upper-order bits and 8 lower-order bits of the FLG register, 16 bits in total, in the stack area, then saves 16 lower-order bits of the program counter. Figure 2.7.6 shows the state of the stack as it was before the acceptance of the inter- rupt request, and the state the stack after the acceptance of the interrupt request. Save other necessary registers at the beginning of the interrupt routine using software. Using the PUSHM instruction alone can save all the registers except the stack pointer (SP). Address Content of previous stack Stack area [SP] Stack pointer value before interrupt occurs m m – 1 m – 2 m – 3 m – 4 Stack status before interrupt request is acknowledged Stack status after interrupt request is acknowledged Content of previous stack m + 1 MSB LSB m m – 1 m – 2 m – 3 m – 4 Address Flag register (FLGL) Content of previous stack Stack area Flag register (FLGH) Program counter (PCH) [SP] New stack pointer value Content of previous stack m + 1 MSB LSB Program counter (PCL) Program counter (PCM) Figure 2.7.6 State of stack before and after acceptance of interrupt request |
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