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PIC16C925/CL 数据表(PDF) 111 Page - Microchip Technology |
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PIC16C925/CL 数据表(HTML) 111 Page - Microchip Technology |
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111 / 182 page  2001 Microchip Technology Inc. Preliminary DS39544A-page 109 PIC16C925/926 12.6 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., the W and STATUS reg- isters. This will have to be implemented in software. Example 12-1 stores and restores the STATUS, W, and PCLATH 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 code in the example: e) Stores the W register. f) Stores the STATUS register in bank 0. g) Stores the PCLATH register. h) Executes the ISR code. i) Restores the STATUS register (and bank select bit). j) Restores the W and PCLATH registers. EXAMPLE 12-1: SAVING STATUS, W, AND PCLATH REGISTERS IN RAM MOVWF W_TEMP ;Copy W to 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 MOVF PCLATH, W ;Only required if using pages 1, 2 and/or 3 MOVWF PCLATH_TEMP ;Save PCLATH into W CLRF PCLATH ;Page zero, regardless of current page BCF STATUS, IRP ;Return to Bank 0 MOVF FSR, W ;Copy FSR to W MOVWF FSR_TEMP ;Copy FSR from W to FSR_TEMP : :(ISR) ;Insert user code here : MOVF PCLATH_TEMP, W ;Restore PCLATH MOVWF PCLATH ;Move W into PCLATH 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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