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APPENDIX E
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: Interrupt Handler to be relocated to 0x00004 asm IntHandler movwf int_w ; Save the Context Registers movf STATUS, w bcf STATUS, RP0 ; Move to bank 0 bcf STATUS, RP1 movwf int_status movf FSR, w movwf int_fsr movf PCLATH, w movwf int_pclath ; #### - Execute Interrupt Handler Code Here movf int_pclath, w movwf PCLATH movf int_fsr, w movwf FSR movf int_status, w movwf STATUS swapf int_w, f swapf int_w, w ret e endasm ; Finished, restore the Context ; Registers
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The interrupt template code provides context saving and restoring for the worst-case condition. I am assuming that execution is taking place in something other than bank 0, that the FSR has been given a speci c value, and that the PIC microcontroller has more than one page of program memory. If you use this template in your own applications, I do not recommend that the preceding above be changed. The only way you can be sure that the index register is not being used and that execution will be in bank 0 along with the processor taking program memory addresses out of page 0 is to look at the code produced by the compiler. Rather than going to this trouble, you should just use the preceding template and insert your interrupt handler code at the comment with #### inside it. There is one issue that you should be aware of when you are adding an assemblylanguage interrupt handler, and this is that you should make sure that no critically timed PICBASIC operations are executing when the interrupt is acknowledged. If, for example, a serial transfer were taking place when the interrupt request was received and acknowledged, then you would end up changing the timing and the data that is potentially received or sent. To ensure that this doesn t happen, you will have to disable interrupts while the critically timed operation is executing. Mathematical operators used in assignment statements and PICBASIC instructions are very straightforward in PICBASIC and work conventionally. In BASIC Stamp
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PBASIC, you must remember that the operations execute from right to left. This means that the statement
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A = B * C + D
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which you would expect to operate as
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Multiply B and C Add the results from 1. to D
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in PBASIC returns the result
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Get the Sum of C and D Multiply the results from 1. With B
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PICBASIC does not follow the PBASIC evaluation convention and returns the expected result from complex statements such as the preceding one. This means that in PICBASIC you do not have to break complex statements up into single operations, as you do in PBASIC, to avoid unexpected expression evaluation. If you are using a BASIC Stamp to prototype PICBASIC applications, then I recommend that you break up the complex statements and use the temporary values. The mathematical operators used are listed in Table E.12 along with their execution priority and parameters. All mathematical operators work with 16-bit values. Along with the mathematical operators, the if statement uses the test conditions listed in Table E.13. Note that both the BASIC standard labels and the C standard labels are used. Parm1 and Parm2 are constants, variables, or statements made up of variables or statements along with the different mathematical operators and test conditions. When a test condition is true, a nonzero is returned; if it is false, then a zero is returned. Using this convention, single-variable parameters can be tested in if statements rather than performing comparisons of them to zero. The PICBASIC instructions are based on the Parallax BASIC Stamp (PBASIC) language, and while there are a lot of similarities, they are really two different languages. In Table E.14 I have listed all the PICBASIC instructions and indicated any special considerations that should be made for them with respect to being compiled in a PIC microcontroller. These instructions are really library routines that are called by the mainline of the application. I am mentioning this because you will notice that the size of the application changes based on the number of instructions that are used in the application. You may nd that you can reduce the program memory size drastically by looking at the different instructions that are used and change the statements to assembler or explicit PICBASIC statements. When I speci ed the various instructions in Table E.14, note that I used square brackets ([ and ]) to specify data tables in some instructions. For this reason, I have speci ed optional values using braces ({ and }), which breaks with the conventions used in the rest of this book.
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