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PIC12F683 Datasheet(PDF) 90 Page - Microchip Technology |
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PIC12F683 Datasheet(HTML) 90 Page - Microchip Technology |
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90 / 148 page  PIC12F683 DS41211B-page 88 Preliminary 2004 Microchip Technology Inc. 12.5 Context Saving During Interrupts During an interrupt, only the return PC value is saved on the stack. Typically, users may wish to save key registers during an interrupt (e.g., W and Status registers). This must be implemented in software. Since the lower 16 bytes of all banks are common in the PIC12F683 (see Figure 2-2), temporary holding regis- ters, W_TEMP and STATUS_TEMP, should be placed in here. These 16 locations do not require banking and therefore, makes it easier to context save and restore. The same code shown in Example 12-1 can be used to: • Store the W register. • Store the Status register. • Execute the ISR code. • Restore the Status (and Bank Select Bit register). • Restore the W register. EXAMPLE 12-1: SAVING STATUS AND W REGISTERS IN RAM Note: The PIC12F683 normally does not require saving the PCLATH. However, if com- puted GOTOs are used in the ISR and the main code, the PCLATH must be saved and restored in the ISR. MOVWF W_TEMP ;Copy W to TEMP register SWAPF STATUS,W ;Swap status to be saved into W CLRF STATUS ;bank 0, regardless of current bank, Clears IRP,RP1,RP0 MOVWF STATUS_TEMP ;Save status to bank zero STATUS_TEMP register : :(ISR) ;Insert user code here : SWAPF STATUS_TEMP,W ;Swap STATUS_TEMP register into W ;(sets bank to original state) MOVWF STATUS ;Move W into Status register SWAPF W_TEMP,F ;Swap W_TEMP SWAPF W_TEMP,W ;Swap W_TEMP into W |
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