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is required, where Cond is one of the values speci ed in Table 8.2. By selecting a STATUS ag (carry on zero) to test, the execution of the goto instruction can be speci ed, providing you with a simple way of implementing the conditional jumps using the code listed in Table 8.3.

Jump if equal Jump if not equal Jump if FIRST is greater than the second Jump if FIRST is greater than or equal to the second Jump if FIRST is less than the second Jump if FIRST is less than or equal to the second

movf A, w/movlw A subwf B, w/sublw B btfsc STATUS, Z goto Label ; Jump if Z = 1 movf A, w/movlw A subwf B, w/sublw B btfss STATUS, Z goto Label ; Jump if Z = 0 movf B, w/movlw A subwf B, w/sublw B btfss STATUS, C goto Label ; Jump if C = 0 movf B, w/movlw B subwf A, w/sublw B btfsc STATUS, C goto Label ; Jump if C = 1 movf B, w/movlw B subwf A, w/sublw A btfss STATUS, C goto Label ; Jump if C = 0 movf A, w/movlw A subwf B, w/movlw B btfsc STATUS, C goto Label ; Jump if C = 1

A B != 0

This is a useful table to remember when you are working on PIC applications, even if you aren t simply converting high level language source code by hand into PIC microcontroller assembly. Negation of the contents of a le register is accomplished by performing the two s complement operation. By de nition, this is done by inverting the contents of a register and then incrementing:

If the contents to be negated are in the w register, there are a couple of tricks that can be used to carry this out. For mid-range devices, the sublw 0 instruction can be used:

As you prepare your material, determine what information the audience members share in common. It s a good idea to start talking at a level they all understand and quickly bring the less knowledgeable members of the group up to speed. It may be necessary to de ne any acronyms you use.

However, in low-end PIC microcontroller devices, there is a little trick you can use, and that is to add and subtract the w register contents with a register as shown below:

= 361

Reg should be chosen from the le registers and not any of the hardware registers that may change between execution of the instructions.

One of the most frustrating things to do is to respond based on the status of two bits. In the past, I found that I had to come up with some pretty funky code, only to feel like it was not good enough. To try and nd different ways of carrying out these tasks, I spent some time experimenting with two skip-on-bit-condition instructions. The two skip parameters are used in such a way that the rst one jumps to an instruction if a case is true, and the second jumps over the instruction if the second case is not true. To show how the double-skip-on-bit-condition instructions could be used, consider the example of setting a bit if two other bits are true (the result is the AND of two arbitrary bits). You could use the code

bcf Result btfss A goto Skip btfsc B bsf Result Skip: ; Assume A and C = 0 ; A = 0, don t set Result ; B = 0, don t set Result ; A = B = 1, set result

This code is quite complex and somewhat dif cult to understand. A further problem with it is that it can return after a different number of cycles depending on the state of A. If A is reset, the code will return after four instruction cycles. If it is set, six instruction cycles will pass before execution gets to Skip.

By combining the two tests, the following code could be used to provide the same function:

bsf Result btfsc A btfss B bcf Result ; ; ; ; Assume A = B = A == 0, Result B == 1, Result A == 0 or B == 1 = 0 = 1 0, Result = 0

This code is smaller, always executes in the same number of cycles, and is easier to work through and see what is happening. An OR function could be implemented similarly:

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