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TABLE 16.16 PORTA BIT MODES AS DEFINED BY THE ADCON1 BITS OF A PIC16C71 ADCON1 BITS AN3 AN2 AN1 AN0
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This is not fast enough for most electronics operations and probably not fast enough for audio decoding (especially with the slow digital processing capabilities of the PIC microcontroller s processor). I m pointing this out to indicate that the PIC microcontroller s ADC is best used for relatively slowly changing inputs. To measure analog voltages, the analog input pins of the PIC microcontroller, which are usually in port A, have to be set to analog input on power-up; the analog input pins normally are set to analog input and not digital I/O. To specify the modes, the ADCON1 register is written to. For example, in Table 16.16 I have listed the different ADCON1 bit values and corresponding PORTA pin operational modes in the PIC16C71. When I use an ADC-equipped PIC microcontroller in an application where all the PORTA pins have to be digital I/O, I normally set the pins to digital operations right at the start of the application, before writing to the TRISA register or initializing the state of the pins. Until the pins are changed to digital I/O, they always will return 0 and cannot be set to an output value of 1. Normally, when the ADC is used in a PIC microcontroller, the voltage reference is from ground to Vdd. If this range is not acceptable, or if the power supply is unreliable, a new reference voltage can be speci ed. In some devices that are equipped with ADCs, the lower-voltage reference can be speci ed externally as well. The bit de nition of ADCON1 is part-number-speci c and changes based on the device part number, number of PORTA pins, and the number of bit resolution provided by the ADC. There is one generality that you should be aware of: When the ADCON1 bits are all set, the PORTA I/O pins are all put into digital operation. The ADCON0 register is used to control operation of the ADC. The bits of the register typically are de ned as in Table 16.17. The ADC consumes power even when it is not being used, and for this reason, if the ADC is not being used, ADON should be reset. If the PIC microcontroller s ADC is capable of returning a 10-bit result, the data is stored in the two ADRESH and ADRES registers. When 10-bit ADC results are available, the data can be stored in ADRESH/ADRESL in two different formats. The rst is to store the data right justi ed with the most signi cant 6 bits of ADRESH loaded with 0 and the least two signi cant bits loaded with the two most signi cant bits of the result. This format is useful if the result is going to be used as a 16-bit number, with all the bits used to calculate an average.
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TABLE 16.17 BIT
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ADCON0 REGISTER BIT DEFINITIONS FUNCTION
ADCS1 ADCS0 bits, used to select the TAD clock. 11 Internal 250-kHz oscillator 10 FOSC/32 01 FOSC/8 00 FOSC/2
CHS2 CHS0 Bits used to select which analog input is to be measured; these bits and their operation are part number speci c. GO/_DONE Set bit to start ADC conversion; reset by hardware when ADC conversion is complete. ADIF Set on completion of ADC conversion and requests an interrupt. ADON Set to enable the ADC.
2 1 0
The second 10-bit ADC result format is left justi ed, and the 8 most signi cant bits are stored in ADRESH. This format is used when only an 8-bit value is required in the application, and the two least signi cant bits can be lopped off or ignored. To do an analog to digital conversion, the following steps should be taken:
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