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0x0100 - 0x0C4 ; Initialize Dlay for a 20 msec Dlay ; Delay 0x0100 - 0x00A Dlay + 1 STATUS, Z ; Make Sure that Zero is Reset
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incfsz Dlay, f goto $ + 2 incf Dlay + 1, f if (Direction < 0) btfsc PORTA, 0 else btfss PORTA, 0 ; endif goto $ - 11 ; btfss STATUS, Z ; goto $ - 6 endm ;
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Button Still Released No - Loop Around Again Zero Flag Set (20 mSecs Past )
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PAGE __CONFIG _CP_OFF & _WDT_OFF & _XT_OSC & _PWRTE_ON ; Note that the WatchDog Timer is OFF ; Mainline of Random org 0 nop
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movlw movwf bsf clrf movlw movwf bcf Loop:
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0x0FF ; PORTB STATUS, RP0 TRISB ^ 0x080 ; 0x0D0 ; Assign OPTION_REG ^ 0x080 STATUS, RP0 ; ; ; ; ; ;
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Turn off all the LEDs initially
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Make All 8 PortB Bits Output Prescaler of 1:1 to TMR0 ; Load the Option Register Value
Loop Here Wait for Key to Go Up Location for Stopping after Up Debounce Wait for Key to Go Down Output the TMR0 Value
Debounce Up nop Debounce Down comf movwf goto TMR0, w PORTB Loop
As I indicated at the start of this experiment, the code simply starts off TMR0 with the prescaler assigned but using a 1:1 value. This means that TMR0 is updated once every two instruction cycles. The Loop code waits for the button on RA0 to go high, and then when it is pressed (and debounced), the current value in TMR0 is output onto the eight LEDs. To demonstrate the random nature of the application, I pressed the button on RA0 16 times and recorded the results in Table 20.7. As you can see in this table, the numbers are reasonably random. Actually, I was a bit surprised that the same value didn t come up twice. The statistical birthday test can be applied to this situation to see how many button presses have to be made before there is better than a 50 percent chance of two numbers being the same. To compute this, if you assume that the TMR0 value returned can be any number from 0 to 255, there are 256 different opportunities for different values. For the second random number generated to not be equal to the rst, the chances are 255/256. For the third number not to be equal to the rst or second, the chances are 255/256 254/256. The ultimate product is multiplied by each time the button is pressed. This is computed until there is a 50 percent chance for the number pressed not to be equal to anything before it. I ve always found statistics to be the science of the negative rather than the positive. (If you ve taken statistics, you ll know what I m talking about). In any case, there will have to be 18 presses until there is a 50 percent chance of a repeated random number. It took me 8 additional presses (for a total of 24) to get 0xA9, which matches the fourteenth press.
PIC MICROCONTROLLER APPLICATION BASICS
TABLE 20.7 RANDOM NUMBERS PRODUCED BY RANDOM EXPERIMENT BUTTON PRESS TMR0 VALUE
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x43 0xBA 0x75 0x12 0xC3 0xD2 0x49 0x00 0x6A 0xE8 0xC6 0x44 0x6C 0xA9 0xC4 0xF9
short: THE SIMPLEST PRACTICAL PIC MICROCONTROLLER APPLICATION POSSIBLE
The title of this experiment probably seems somewhat arrogant, but I think that I have created a small application that does not make a liar out of me. This application is only two instructions long, and I think that it shows off some obscure aspects of the PIC microcontroller, as well how PIC microcontroller programming works. It also will provide you with a simple application that can be used in a variety of situations to check on the health of a PIC microcontroller before an application is programmed in. The application itself simply ashes an LED on RB7. The circuit that I used is shown in Fig. 20.14 and is wired as in Fig. 20.15. The bill of materials is listed in Table 20.8. The application code itself is honestly only two instructions long and will cause the LED to ash at about 7.5 times per second when the PIC microcontroller is running at 4 MHz. The application itself can be found in the code\short folder. The two instructions of the application code are just
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