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PIC18F4585 Datasheet(PDF) 6 Page - Microchip Technology |
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PIC18F4585 Datasheet(HTML) 6 Page - Microchip Technology |
6 / 14 page PIC18F2585/2680/4585/4680 DS80202G-page 6 © 2007 Microchip Technology Inc. EXAMPLE 3: An optimized C18 version is provided in Example 4. This example illustrates how it reduces the instruction cycle count from 10 cycles to 3. Date Codes that pertain to this issue: All engineering and production devices. EXAMPLE 4: #pragma interruptlow MyLowISR void MyLowISR(void) { // Handle low priority interrupts. } // Although MyHighISR is a high priority interrupt, use interruptlow pragma so that // the compiler will not use retfie FAST. #pragma interruptlow MyHighISR void MyHighISR(void) { // Handle high priority interrupts. } #pragma code highVector=0x08 void HighVector (void) { _asm goto MyHighISR _endasm } #pragma code /* return to default code section */ #pragma code lowVector=0x18 void LowVector (void) { _asm goto MyLowISR _endasm } #pragma code /* return to default code section */ #pragma code high_vector_section=0x8 void high_vector (void) { _asm CALL high_vector_branch, 1 _endasm } void high_vector_branch (void) { _asm POP GOTO high_isr _endasm } #pragma interrupt high_isr void high_isr (void) { ... } |
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