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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST7263BEx 데이터시트(PDF) 31 Page - STMicroelectronics |
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ST7263BEx 데이터시트(HTML) 31 Page - STMicroelectronics |
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31 / 186 page  ST7263Bxx Central processing unit Doc ID 7516 Rev 8 31/186 pointed to by the SP. Then the other registers are stored in the next locations as shown in Figure 10. ● When an interrupt is received, the SP is decremented and the context is pushed on the stack. ● On return from interrupt, the SP is incremented and the context is popped from the stack. A subroutine call occupies two locations and an interrupt five locations in the stack area. Figure 10. Stack manipulation example Figure 11. CPU registers PCH PCL SP PCH PCL SP PCL PCH X A CC PCH PCL SP PCL PCH X A CC PCH PCL SP PCL PCH X A CC PCH PCL SP SP Y CALL Subroutine Interrupt Event PUSH Y POP Y IRET RET or RSP @ 017Fh @ 0100h Stack Higher Address = 017Fh Stack Lower Address = 0100h ACCUMULATOR X INDEX REGISTER Y INDEX REGISTER STACK POINTER CONDITION CODE REGISTER PROGRAM COUNTER 70 1C 1 1 HI NZ RESET VALUE = RESET VECTOR @ FFFEh-FFFFh 70 70 70 0 7 15 8 PCH PCL 15 8 70 RESET VALUE = STACK HIGHER ADDRESS RESET VALUE = 1X 11 X 1 X X RESET VALUE = XXh RESET VALUE = XXh RESET VALUE = XXh X = undefined value |
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