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movf andlw movwf movlw addwf movf A, w 0x3F temp 3 temp, w PORTB
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The temp register contains the intermediate value of the calculation to avoid storing the temporary value in the destination (PORTB), which could affect the operation of the application. The intermediate value is saved from the source and retrieved for processing and saved in the destination. As a rule of thumb, you must never use a hardware register as a temporary register because it can cause you a lot of problems in your application (and ones that are particularly dif cult to nd and x). This example illustrates an important point in porting applications (or even maintaining them): You have to understand exactly the requirements of the code. In these examples, the original author may have been simply sloppy (since the result is the same in the least signi cant 6 bits regardless of the method used), or there was some de nite need to set bit 6 if the original value in the least signi cant bits of A were 0x3D or greater at the same time as the sum of these bits and 3 were stored in PORTB. Making an invalid assumption on the purpose of the code that could result in an error in the operation of the application will be extremely dif cult to nd and x. Subroutine calls can be quite awkward in low-end devices because the label must be located in the rst 256 bytes of the PIC microcontroller s instruction page. This is due
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to how the goto and call instructions are de ned, a result of how bits are allocated in low-end PIC microcontrollers. If you look at the instruction bit patterns for the two instructions, i.e., goto 0b0 101k kkkk kkkk call 0b0 1001 kkkk kkkk you ll see that goto has 9 bits available to the jump to the address, whereas call has only 8. The 9 address bits in the goto instruction mean that the goto address can be anywhere in the 512 instructions of a page. The 8 bits of the call instruction mean that only 256 addresses in the instruction page can be accessed. This restriction can be a problem in applications if it is not planned for. To counter this problem, the address that your subroutine calls can be a goto, in the rst 256 instructions of a page, pointing to the actual subroutine code. This looks like
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call : sub1: goto sub2: goto ; sub1 label/goto redirecting execution subroutine1 ; to the second 256 instructions in page subroutine2 sub1
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Table operations have a similar problem with the two instructions addwf PCL, f and movwf PCL having a similar restriction to call and also can be located only in the rst 256 instructions of a page. This is due to the inability of accessing bit 8 of the address, and a zero is used in its place. PA0 in the STATUS register affects address bit 9, and PCL affects address bits 0 through 7. This restriction means that no tables can be longer than 256 instructions in low-end PIC microcontrollers. There are two other restrictions you also should be aware of for low-end devices. The rst is the availability of only two positions on the program counter stack. This means that there can only be one nesting level in low-end applications. Subroutines that have been called by other subroutines cannot call subroutines themselves. This is not a particularly onerous restriction because the number of nesting levels in all PIC microcontrollers is quite limited. When you are beginning to develop applications for the PIC microcontroller, I don t recommend using many nested subroutines because of the possibility of interrupts causing the program counter to over ow the stack and return addresses being lost in some cases. The second restriction is the availability of only a retlw (return from subroutine after loading the w register with a constant) instruction for returning from subroutines. There is no return statement in low-end PIC microcontrollers. In early versions of MPASM, when a return instruction was encountered in a lowend application, it would convert the instruction into
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