PIC16C781 datasheet(73/186 Pages) MICROCHIP

73 / 186 page

 2001 Microchip Technology Inc.

Preliminary

DS41171A-page 71

PIC16C781/782

9.1.2

ADCON1 REGISTER

The ADCON1 register, shown in Register 9-3, controls

the reference voltage selection for the ADC module.

Bits

VCFG<1:0>

select

the

reference

voltage

(ADCREF).

9.1.3

ADRES REGISTER

The ADRES register, shown in Register 9-2, contains

the 8-bit result of the conversion. At the completion of

the ADC conversion:

• 8-bit result is loaded into ADRES.

• GO/DONE bit (ADOCN0<2>) is cleared.

• ADC interrupt flag bit ADIF (INTCON<6> and

PIR1<6>) are set.

• If the ADC interrupt is enabled, an interrupt is also

generated.

ADC RESULT REGISTER (ADRES: 1Eh)

ADC CONTROL REGISTER 1 (ADCON1: 9Fh)

R/W-x

AD7

AD6

AD5

AD4

AD3

AD2

AD1

AD0

bit 7

bit 0

bit 7-0

AD<7:0>: ADC Conversion Results bits

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

U-0

R/W-0

U-0

—

VCFG1

VCFG0

—

bit 7

bit 0

bit 7-6

Unimplemented: Read as ’0’

bit 5-4

VCFG<1:0>: Voltage Reference Configuration bits

= AVDD

= VREF1

= VR

= VDAC

bit 3-0

Unimplemented: Read as ’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

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