PIC16F526-ISLASHP datasheet(61/122 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS41326D-page 61

PIC16F526

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 9

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. 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

ANS1

ANS0

ADCS1

ADCS0

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

ANS<1:0>: ADC Analog Input Pin Select bits(1), (2), (5)

00 = No pins configured for analog input

01 = AN2 configured as an analog input

10 = AN2 and AN0 configured as analog inputs

11 = AN2, AN1 and AN0 configured as analog inputs

bit 5-4

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

00 = FOSC/16

01 = FOSC/8

10 = FOSC/4

11 = INTOSC/4

bit 3-2

CHS<1:0>: ADC Channel Select bits(3, 5)

00 = Channel AN0

01 = Channel AN1

10 = Channel AN2

11 = 0.6V absolute voltage reference

bit 1

GO/DONE: ADC Conversion Status bit(4)

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 termi-

nates 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: When the ANS bits are set, the channels selected will automatically be forced into Analog mode, regardless of the pin

function previously defined. The only exception to this is the comparator, where the analog input to the comparator and

the ADC will be active at the same time. It is the users responsibility to ensure that the ADC loading on the comparator

input does not affect their application.

2: The ANS<1:0> bits are active regardless of the condition of ADON.

3: CHS<1:0> bits default to 11 after any Reset.

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

5: C1OUT, when enabled, overrides AN2.

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