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; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
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A resistor value is read repeatedly and displayed. This program is a modi cation of PROG17.ASM Hardware Notes: PIC16F84 running at 4 MHz Reset is tied directly to Vcc and PWRT is Enabled. A 10K Pot along with a 0.1 F Cap and 100 Ohm Series Resistor on PORTA.0 A 220 Ohm Resistor and LED is attached to all the PORTB.7:0 Application Updated: 99.12.26 for 4 MHz PIC16F84. Myke Predko 96.06.02 LIST R=DEC INCLUDE p16f84.inc
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Registers
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__CONFIG _CP_OFF & _WDT_OFF & _XT_OSC & _PWRTE_ON PAGE Mainline of ADCLess 0
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org nop movlw movwf clrf
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0x0FF PORTB PORTA
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Turn off all the LED s Use PORTA as the Input
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bsf STATUS, RP0 clrf TRISB & 0x07F movlw 0x0D2 movwf OPTION_REG & 0x07F ; Clock bcf STATUS, RP0 movlw movwf Loop: bsf bcf PORTA, 0 INDF, 0 TRISA FSR
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; Page 0 to set Port Direction ; Set all the PORTB bits to Output ; Setup the Timer to fast count ; Put in Divide by 8 Prescaler for 4x ; Go back to Page 0
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; Have to Set/Read PORTA.0 ; - Use FSR instead of Changing RP0
Charge Cap on PORTA.0 Make PORTA.0 an Output
PIC MICROCONTROLLER APPLICATION BASICS
movlw 0x0100 - 10 clrf TMR0 Sub_Loop1: movf TMR0, w btfss STATUS, Z goto Sub_Loop1 bsf INDF, 0 clrf TMR0 Sub_Loop2: btfsc PORTA, 0 goto Sub_Loop2 comf movwf goto TMR0, w PORTB Loop
; ; ; ; ; ;
Charge the Cap Now, Wait for the Cap to Charge Wait for the Timer to Reach 10 Get the Timer Value Has the Timer Over owed No, Loop Around again
; Now, Wait for the Cap to Discharge ; and Time it. ; Just wait for PORTA.1 to go Low
Get the Timer Value
Get another Time Sample
The circuit itself is relatively easy to build, with the breadboard version being shown in Fig. 20.19. Note that the potentiometer is wired somewhat differently from what you are probably used to. It is not used as a voltage divider but a variable path to ground for the charge in the capacitor. The bill of materials is listed in Table 20.9. This is one experiment that I have not spent a lot of time simulating. The reason should be obvious; operation of the RC network with varying resistances cannot be easily simulated by MPLAB. A stimulus le could produce simulated delays, but I decided to go ahead with the application directly.
+5 Volt P/S
10 K
The breadboard wiring circuit for ADCLess.
0.1 uF
PIC1F84
4 MHz
DS275
ANALOG INPUT/OUTPUT
TABLE 20.9 BILL OF MATERIALS FOR THE ADCLess EXPERIMENT PART DESCRIPTION
PIC 0.1- F 10-k 4-MHz 10 LEDs 220 10-k pot Misc.
PIC16F84 04/P 0.1- F tantalum 10 k , 1/4 W 4 MHz with built-in capacitors Red LED bargraph display 220 10-k , 1/4 W potentiometer
Breadboard, wiring, +5-V power supply
If you work through different capacitors for the RC network in this experiment, you ll discover how dependent the circuit is on the capacitor value. I found that after trying four different capacitors, I got four different upper limits, with some going beyond 0xFF (the limit that can be returned by the 8-bit TMR0) and one having a maximum value of 0x46. This leads to the biggest problem with this circuit, and that is its dependency on the parts used. Because of the variance to the capacitor value, I would not recommend this circuit for critical resistance measurements. Yes, a precision cap and power supply, along with characterizing the timer values from the PIC microcontroller, would give accurate results, but as with using precision parts for an RC oscillator, this is not reasonable for volume production. In the Basic Stamp, a scale value is speci ed, and the result is returned as a fraction of this value. While this is better than trying to match parts, it still requires some extra work to tune the scale value to the individual circuit. There is also another problem with this circuit that you probably won t observe unless you put an oscilloscope or digital multimeter (DMM) on the RA0 pin. When the resistor is set to a very low value, the RA0 pin is essentially connected to ground. Many people put in a 100- resistor to prevent a dead short to ground, but this increases the time for the capacitor to become fully charged. In this experiment, I have not included the 100- current-limiting resistor between RA0 and the RC network so that you can observe this issue. The advantages of this circuit and software are its simplicity and few PIC microcontroller advanced resources used. While not providing high accuracy, the circuit does provide excellent repeatability that can be very useful in many applications. It is not an optimal application because interrupts must be disabled during a resistance value read, and the limits to the circuit must be established rst based on the value of the capacitor used in the RC network.
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