PIC16F570 datasheet(56/129 Pages) MICROCHIP

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PIC16F570

DS40001684E-page 56

 2013-2014 Microchip Technology Inc.

9.1.6

ANALOG CONVERSION RESULT

The ADRES register contains the results of the last

conversion. These results are present during the

sampling period of the next analog conversion process.

After the sampling period is over, ADRES is cleared

(= 0). A ‘leading one’ is then right shifted into the

ADRES to serve as an internal conversion complete

bit. As each bit weight, starting with the MSB, is

converted, the leading one is shifted right and the

converted bit is stuffed into ADRES. After a total of nine

right shifts of the ‘leading one’ have taken place, the

conversion is complete; the ‘leading one’ has been

shifted out and the GO/DONE bit is cleared.

If the GO/DONE bit is cleared in software during a

conversion, the conversion stops and the ADIF bit will

not be set to a ‘1’. The data in ADRES is the partial

conversion result. This data is valid for the bit weights

that have been converted. The position of the ‘leading

one’ determines the number of bits that have been

converted. The bits that were not converted before the

GO/DONE was cleared are unrecoverable.

ADCON0: A/D CONTROL REGISTER

R/W-1

R/W-0

ADCS1

ADCS0

CHS3

CHS2

CHS1

CHS0

GO/DONE

ADON

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-6

ADCS<1:0>: ADC Conversion Clock Select bits

00 =FOSC/16

01 =FOSC/8

10 =FOSC/4

11 = INTOSC/4

bit 5-2

CHS<3:0>: ADC Channel Select bits(1)

0000 = Channel 0 (AN0)

0001 = Channel 1 (AN1)

0010 = Channel 2 (AN2)

0011 = Channel 3 (AN3)

0100 = Channel 4 (AN4)

0101 = Channel 5 (AN5)

0110 = Channel 6 (AN6)

0111 = Channel 7 (AN7)

1xxx = Reserved

1111 = 0.6V Fixed Input Reference (VFIR)

bit 1

GO/DONE: ADC Conversion Status bit(2)

1 = ADC conversion in progress. Setting this bit starts an ADC conversion cycle. This bit is automatically

cleared by hardware when the ADC is done converting.

0 = ADC conversion completed/not in progress. Manually clearing this bit while a conversion is in process

terminates the current conversion.

bit 0

ADON: ADC Enable bit

1 = ADC module is operating

0 =

ADC module is shut-off and consumes no power

Note 1:

CHS<3:0> bits default to 1 after any Reset.

If the ADON bit is clear, the GO/DONE bit cannot be set.

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