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PICDEM TM Lab Development Board User’s Guide
5.2.3
5.2.3.1
Lab 1: Simple ADC
NEW REGISTERS USED IN THIS LAB
To configure the peripherals used in this lab, the following registers are used:
1. ADC Control Register 0: ADCON0 (Register 9-1 in Section 9 of the PIC16F690
Data Sheet)
- Configures ADC conversion result justification.
- Select ADC reference voltage.
- Selects ADC input channel (i.e., pin with analog voltage to be converted).
- Starts ADC conversion and determines when ADC conversion is complete.
- Enables the ADC peripheral.
2. ADC Control Register 1: ADCON1 (Register 9-2 in Section 9 of the PIC16F690
Data Sheet)
- Determines ADC conversion clock.
3. ADC Result Register high: ADRESH (see Register 9-3 in Section 9 of the
PIC16F690 Data Sheet)
- Holds upper 8-bits or upper 2-bits (depending on justification selected) of
10-bit ADC conversion result.
4. ADC Result Register low: ADRESL (see Register 9-4 in Section 9 of the
PIC16F690 Data Sheet)
- Holds lower 8-bits or lower 2-bit (depending on justification selected) of 10-bit
ADC conversion result.
5.2.3.2
OVERVIEW
In this lab, the ADC peripheral on the PIC16F690 is used to perform a simple
conversion of an analog voltage present on pin 13. The voltage is varied using a
100K Ω potentiometer. This voltage is compared against a reference voltage to
generate a 10-bit binary result via successive approximation stored into two 8-bit ADC
result registers ADRESH and ADRESL. The ADC result is software selectable as either
left or right justified as shown in Section 9.1.6 of the PIC16F690 Data Sheet. This
application will configure the ADC result as left justified with the four Most Significant
bits of the 10-bit result output to the RC0, RC1,RC2 and RC3 PORTC pins used to light
connected LEDs accordingly.The PICDEM? Development Board configuration
DS41369A-page 76
? 2009 Microchip Technology Inc.
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