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If you get sick when you are scheduled to make a presentation, the answer to what to do is usually The show must go on. If, however, you re about to pass out or have any gastrointestinal challenges, consider the health of the audience, and attempt to get a replacement speaker or reschedule. If you have a cold or congestion, you can probably stand before an audience without sounding too stuffy. Most of us tend to think we sound far worse than we really do. If you don t focus on feeling less than 100 percent, the healthy body takes over, and you can sound just ne. If your audience is small and the stakes are low, maybe the meeting can be rescheduled. If the stakes are high, the event should go on. If you re not sure whether you should speak, ask the person who scheduled the meeting. Sometimes it s simple to reschedule an event. Sometimes it s not. If you are working with a meeting planner, let that person make the nal decision on cancellation.

ConditionEnd:

To implement the nonstructured case, you have to invert the test. To implement the structured if/else C code in PIC assembler, you would write it as:

ConditionEnd:

The actual conditional execution code can be written in such a way to simulate structured code, and in fact, when you rst start writing PIC microcontroller assembly language code you can block it out using pseudo C code, like the example above, and then convert it to assembly code using the two steps I show here. Doing the correct bit condition test is something to be cognizant of when you rst start working with the PIC microcontroller. Conditional jumps based on a comparison of two values follow a very de nite format that you can use when you rst start programming. From a high level, the code implements:

The basic instruction format is:

where FirstValue, SecondValue, #, and ag are de ned in Table 7.1. If either of the conditional values are constants, then movf or subwf are replaced with movlw or sublw, respectively. In Table 7.1, I included the complement tests for when you are creating your own structured code.

btfs#

To envision what effect flow rates have upon exit temperature, Eg. (9.11) is plot ted in Fig. 9.4 with the same abscissa and parameter that were used in Fig. 9.3.

if (a == b) then goto Label if (a != b) then goto Label if (a > b) then goto Label if (a >= b) then goto Label if (a < b) then goto Label if (a <= b) then goto Label

Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictates of our passion, they cannot alter the state of facts and evidence. So said John Adams, second president of the United States.

if (a != b) then goto Label if (a == b) then goto Label if (a <= b) then goto Label if (a < b) then goto Label if (a >= b) then goto Label if (a > b) then goto Label

TABLE 7.2 COMBINING btfsc AND btfss WITH goto TO CREATE JUMP ON STATUS FLAG CONDITIONS btfsc/btfss AND goto INSTRUCTIONS

btfsc STATUS, Z goto Label btfss STATUS, Z goto Label btfsc STATUS, C goto Label btfss STATUS, C goto Label

If you have experience programming in assembly language with other chips, you might wonder why there aren t any jump on STATUS ag condition instructions. The btfsc and btfss instructions with the goto instruction can provide you with this capability, as listed in Table 7.2. Built into the MPLAB assembler, there are a number of pseudo-instructions like these that provide similar functions. Personally, I would recommend that you avoid using these instructions because they mask the true usefulness of the btfsc and btfss instructions and what is actually happening in the program. The discussion on simulating the conditional jump instructions of other processors and implementing simple two-parameter conditional jumps can distract people from the true power of having an architecture that can branch on the condition of any bit in the register address space. Having these instructions avoids the need to use additional instructions to test the value of an arbitrary bit, as would be required in other processors. Flag bits can be very easily changed in the PIC microcontroller using the bcf and bsf instructions and tested using the btfsc and btfss instructions. To show you how these instructions can be used, consider the instructions needed to set a bit in another processor. Using PIC instructions the code would look like:

while in the PIC microcontroller, the following single instruction is required:

Similarly, if a bit is to be tested in a register and execution jumps to a label if it is set, a traditional processor would require the code:

In the PIC microcontroller, the code would be: