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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TMP86CS49UG датащи(PDF) 55 Page - Toshiba Semiconductor |
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TMP86CS49UG датащи(HTML) 55 Page - Toshiba Semiconductor |
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55 / 252 page  Page 41 TMP86CS49UG Figure 3-4 Saving/Restoring General-purpose Registers under Interrupt Processing 3.3.3 Interrupt return Interrupt return instructions [RETI]/[RETN] perform as follows. As for address trap interrupt (INTATRAP), it is required to alter stacked data for program counter (PC) to restarting address, during interrupt service program. Note:If [RETN] is executed with the above data unaltered, the program returns to the address trap area and INTATRAP occurs again.When interrupt acceptance processing has completed, stacked data for PCL and PCH are located on address (SP + 1) and (SP + 2) respectively. 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 [RETI]/[RETN] Interrupt Return 1. Program counter (PC) and program status word (PSW, includes IMF) are restored from the stack. 2. Stack pointer (SP) is incremented by 3. Example 1 :Returning from address trap interrupt (INTATRAP) service program PINTxx: POP WA ; Recover SP by 2 LD WA, Return Address ; PUSH WA ; Alter stacked data (interrupt processing) RETN ; RETURN Interrupt acceptance Interrupt service task Restoring registers Saving registers Interrupt return Saving/Restoring general-purpose registers using PUSH/POP data transfer instruction Main task |
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