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M306V0ME Fiches technique(PDF) 59 Page - Mitsubishi Electric Semiconductor |
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M306V0ME Fiches technique(HTML) 59 Page - Mitsubishi Electric Semiconductor |
59 / 256 page M306V0ME-XXXFP M306V0EEFP MITSUBISHI MICROCOMPUTERS SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER 59 Rev. 1.0 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 |
Numéro de pièce similaire - M306V0ME |
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Description similaire - M306V0ME |
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