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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16C72-10/SP датащи(PDF) 69 Page - Microchip Technology |
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PIC16C72-10/SP датащи(HTML) 69 Page - Microchip Technology |
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69 / 124 page  PIC16C72 Series © 1998 Microchip Technology Inc. Preliminary DS39016A-page 69 10.11 Context Saving During Interrupts During an interrupt, only the return PC value is saved on the stack. Typically, users may wish to save key reg- isters during an interrupt, i.e., W register and STATUS register. This will have to be implemented in software. Example 10-1 stores and restores the W and STATUS registers. The register, W_TEMP, must be defined in each bank and must be defined at the same offset from the bank base address (i.e., if W_TEMP is defined at 0x20 in bank 0, it must also be defined at 0xA0 in bank 1). The example: a) Stores the W register. b) Stores the STATUS register in bank 0. c) Executes the ISR code. d) Restores the STATUS register (and bank select bit). e) Restores the W register. EXAMPLE 10-1: SAVING STATUS, W, AND PCLATH REGISTERS IN RAM MOVWF W_TEMP ;Copy W to W_TEMP register, could be bank one or zero 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 : : Interrupt Service Routine (ISR) - user defined : 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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