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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST7FLITE25F2M6 датащи(PDF) 32 Page - STMicroelectronics |
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ST7FLITE25F2M6 датащи(HTML) 32 Page - STMicroelectronics |
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32 / 166 page  Central processing unit ST7LITE20F2 ST7LITE25F2 ST7LITE29F2 32/166 Doc ID 8349 Rev 5 The stack is used to save the return address during a subroutine call and the CPU context during an interrupt. The user may also directly manipulate the stack by means of the PUSH and POP instructions. In the case of an interrupt, the PCL is stored at the first location pointed to by the SP. Then the other registers are stored in the next locations as shown in Figure 11: ● 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 11. Stack manipulation example 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 @ 01FFh @ 0180h Stack higher address = 01FFh Stack lower address = 0180h |
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