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Figure 3.24 same input.
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Synchronous stimulus always provides the
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me to use the same test case over and over (Fig. 3.24). The test case that you come up with can be saved (and later merged back into this or another application) by clicking on the Advanced button. If you are keeping to a cycle-based measurement, you will have to calculate the instruction count using the formula:
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Instruction Count = Time Delay * Frequency / 4
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To get the instruction count for a 15 ms delay in a 3.58 MHz PIC microcontroller, the formula would return:
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Instruction Count = Time Delay * Frequency / 4 = 15 ms * 3.58 MHz / 4 = 15(10**-3) seconds * 3.58(10**6) cycles/ second / 4 = 13,425 Cycles
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In this example, the cycle step count at 15 ms is 13,462. In the synchronous Stimulus dialog box, this value would be put into the Time entry point. The step counts are absolute, so the cycle count should be added to the step values after the data pattern has been determined. Clocks can be speci ed along with their frequency and the length of time the clock is high or low. The clock input is a useful tool for testing the response of a program to a single input without having to repeatedly push a button in the asynchronous Stimulus dialog box or putting in a large number of Set High and Set Low events at speci c times in the synchronous Stimulus dialog box.
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The last stimulus function listed above is to create an ASCII le, with each line containing a hex value that will be used as a read of an SFR to allow you to simulate the operation of the hardware device and test your code with different values. This, along with the other options of the Stimulus dialog box is quite advanced, and though not that dif cult, requires a fairly sophisticated knowledge of the PIC microcontroller hardware and the application circuitry to ensure that you create the correct input for the functions and understand what the results mean. In earlier versions of MPLAB IDE, creating stimulus for applications was tedious and inconsistent for different functions. In the latest versions of the IDE, creating stimulus les is quite easy and can be done very quickly before the application is burned onto a PIC microcontroller, allowing you to discover beforehand that the application doesn t work. A few moments spent at the start of the application will save hours scratching your head and trying to gure out why the PIC microcontroller isn t doing what you want it to.
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Your First Application While you may feel like you only have a cursory introduc-
tion to the PIC microcontroller and the development process, you do have enough knowledge, as the saying goes, to be dangerous. You should have enough background to create your rst simple application. The application I have chosen is to use a midrange PIC microcontroller to ash an LED. Fig. 3.25 shows the schematic (with the bill of materials in Table 3.12) and Fig. 3.26 shows a photograph of my rst prototype. The circuit should take you less than ve minutes to build and will give you the opportunity to see a PIC microcontroller actually running. The PIC16F684 was chosen for a number of reasons. From a technical perspective, it is an inexpensive Flash-based part, is available in a 14-pin PTH part, is ICSP programmable, and has a built-in oscillator. These technical speci cations allow for a very simple circuit; all it needs is power and the LED/resistor output circuitry to run, and there are enough leftover pins to allow the ICSP connection to be implemented without affecting the operation of the application. Most importantly, I had one sitting on the table next to my desk so I didn t have to go very far to nd a device to try out.
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