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and see what happens. In the simulator, you will see RB0 now going low. When you program the PIC microcontroller with the new code, you will see that the application is now working as you expected . . . Well, almost. There s still one strange problem, and that is that a few moments after the button is pressed, the LED turns off. It will turn on again after the button is pressed, but periodically it will turn back off. At this point, most people would say that it is a reset problem. If you try to simulate the application, chances are that you won t see any problem with the code even if you simulate for a long period of time, up to a second or so (which takes an unreasonable amount of time in MPLAB IDE to get to). So what s going on The problem is that the watchdog timer is enabled. In most PIC microcontrollers, leaving the WDT bit set in the con guration fuses enables the
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watchdog timer. In the debug.asm code, I deliberately enabled it because I thought that leaving it out would be more noticeable than enabling it. The most common problem with the watchdog timer and other configuration fuse enabled features (such as the PIC16F87x s LVP and debug mode) is that they are enabled when the bit is set. Forgetting to put in parameter settings for all the con guration fuses can lead you to some problems where the device won t work or won t work 100 percent properly (as in this case). As I discuss elsewhere in the book, you should make sure that you know what all the con guration fuse options are for the PIC microcontroller part you are using and make sure that they are set properly. Once the _WDT_OFF parameter is added to the __CONFIG statement of the debug.asm source le, the application will run properly. There is still one thing that I am not happy with, and that how the application ends. The last instruction in the application is
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and if I had created this application from somebody else s code, I would be very suspicious of it. The reason for being suspicious is that in a typical application, after a button is pressed and acknowledged, I would think that the code would continue on or get stuck in a hard loop in which it does not jump to any other instructions. Jumping back to Loop, code that has already executed will be repeated over and over again. In this application, this instruction is not a problem, but I would feel more comfortable with
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which does not execute the polling for the button and does not clear PORTB repeatedly. With the xes I ve outlined, the debug.asm code becomes debug x.com. In debug x.com, the lines with problems are commented out with the corrected lines inserted afterward:
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title debug x - An application with Fixed problems FIXED ; ; This is an application to demonstrate how insidious some ; problems ; can be. This application has the three source code ; problems ; xed. The error lines are commented out with the ; correct line ; underneath them. ; ; The application will initially turn on a LED at RB1 and ; wait for ; a button to be pressed. When it is, an LED at RB0 ; should be turned on as well.
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; ; ; ; ; ; ; ; ; ; ; ; ;
Hardware Notes: PIC16F84 running at 4 MHz _MCLR is tied through a 4.7K Resistor to Vcc and PWRT is Enabled A 220 Ohm Resistor and LED is attached to PORTB.0/PORTB.1 and Vcc A 10K pull up is connected to RA0 with a Momentary on Switch Myke Predko 99.12.07
LIST R=DEC ifdef __16F84 INCLUDE p16f84.inc else ifdef __16F877 INCLUDE p16f877.inc endif ; Registers
ifdef __16F84 ; __CONFIG _CP_OFF & _WDT_ON & _XT_OSC & _PWRTE_ON __CONFIG _CP_OFF & _WDT_OFF & _XT_OSC & _PWRTE_ON else ; __CONFIG _CP_OFF & _WDT_ON & _XT_OSC & _PWRTE_ON & _DEBUG_OFF & ; _LVP_OFF & _BODEN_OFF __CONFIG _CP_OFF & _WDT_OFF & _XT_OSC & _PWRTE_ON & _DEBUG_OFF & _LVP_OFF & _BODEN_OFF endif PAGE Mainline of debug x 0
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