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the conditional code executes for a second time, and addresses come out differently. Phase errors are very hard to nd, and chances are that if you have one in one location, there will be a number of them. The best way to avoid phase errors is to always make sure that the same number of instructions are used no matter what path is taken in the conditional assembly. For the preceding code, I can add two nops as the code is inserted if else (assembled if the condition is not true) is active to make sure that no addresses in the application will change:
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if (((($ + 2) & 0x01800) ^ (Label & 0x01800)) != 0) movlw HIGH Label ; Different Pages - Update PCLATH movwf PCLATH else nop ; Add Two instructions to prevent nop ; Phase Errors endif goto Label & 0x07FF ; Jump to Label
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The third problem with this code is that a message may be produced indicating that the jump is to a different page. To avoid this, the goto address should have the current page bits added to it. This changes the code to
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if (((($ + 2) & 0x01800) ^ (Label & 0x01800)) != 0) movlw HIGH Label ; Different Pages - Update PCLATH movwf PCLATH else nop ; Add Two instructions to prevent nop ; Phase Errors endif goto (Label & 0x07FF) | ($ & 0x01800) ; Jump to Label
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The next problem with this code is that it changes the w register. This means that the preceding code cannot be used if the contents of the w register are going to be passed to the destination Label. Instead of explicitly loading PCLATH with the destination, the bits can be changed individually using the code
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if (((($ + 2) & 0x01000) ^ (Label & 0x01000)) != 0) if ((($ + 2) & 0x01000) == 0) bsf PCLATH, 5 ; Label in Pages 2 else bcf PCLATH, 5 ; Label in Pages 0 endif else nop ; No Difference in endif if (((($ + 2) & 0x00800) ^ (Label & 0x00800)) != 0) if ((($ + 2) & 0x00800) == 0) bsf PCLATH, 4 ; Label in Pages 1
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High Pages
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CONDITIONAL ASSEMBLY/COMPILATION
else bcf PCLATH, 4 ; Label in Pages 0 or 2 endif else nop ; No Difference in Low Pages endif goto (Label & 0x07FF) | ($ & 0x01800) ; Jump to Label
Looking at this mess of conditional assembly statements, it is starting to look a lot like a macro, and this is the reason why I have included conditional assembly statements in this chapter. Conditional assembly statements, while simplifying your applications in some ways, will result in fairly complex applications in others. The preceding code has really become the lgoto macro:
lgoto Macro Label if (((($ + 2) & 0x01000) ^ if ((($ + 2) & 0x01000) == bsf PCLATH, 5 else bcf PCLATH, 5 endif else nop endif if (((($ + 2) & 0x00800) ^ if ((($ + 2) & 0x00800) == bsf PCLATH, 4 else bcf PCLATH, 4 endif else nop endif goto (Label & 0x07FF) | endm
(Label & 0x01000)) != 0) 0) ; Label in Pages 2 or 3 ; Label in Pages 0 or 1
No Difference in High Pages
(Label & 0x00800)) != 0) 0) ; Label in Pages 1 or 3 ; Label in Pages 0 or 2
No Difference in Low Pages Jump to Label
($ & 0x01800);
which can be placed anywhere in your mid-range PIC MCU application, with three instructions replacing the macro each time it is encountered. Similar macros for lowend PIC MCU architectures can be created to allow jumping and calling subroutines (this is not an issue in the PIC18 processor architecture because there are instructions that allow movement to any address that the processor can execute). Along with program constants, you also can declare integer variables that can be updated during assembly of the application. The variable directive, appropriately enough, is used to declare the variables with optional initial values, as shown below:
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