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TMP86FH47ADUG Datasheet(PDF) 53 Page - Toshiba Semiconductor |
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TMP86FH47ADUG Datasheet(HTML) 53 Page - Toshiba Semiconductor |
53 / 214 page Page 39 TMP86FH47ADUG 3.4.2.1 Using PUSH and POP instructions If only a specific register is saved or interrupts of the same source are nested, general-purpose registers can be saved/restored using the PUSH/POP instructions. Figure 3-3 Save/store register using PUSH and POP instructions 3.4.2.2 Using data transfer instructions To save only a specific register without nested interrupts, data transfer instructions are available. Example :Save/store register using PUSH and POP instructions PINTxx: PUSH WA ; Save WA register (interrupt processing) POP WA ; Restore WA register RETI ; RETURN Example :Save/store register using data transfer instructions PINTxx: LD (GSAVA), A ; Save A register (interrupt processing) LD A, (GSAVA) ; Restore A register RETI ; RETURN PCL PCH PSW At acceptance of an interrupt At execution of PUSH instruction At execution of RETI instruction At execution of POP instruction b-4 b-3 b-2 b-1 b PCL PCH PSW PCL PCH PSW SP Address (Example) SP SP SP A W b-5 |
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