PIC12C67X datasheet(45/129 Pages) MICROCHIP

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DS30561B-page 45

PIC12C67X

ADCON0 REGISTER (ADDRESS 1Fh)

R/W-0

ADCS1 ADCS0 reserved

CHS1

CHS0

GO/DONE reserved

ADON

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as ‘0’

- n = Value at POR reset

bit7

bit0

bit 7-6:

ADCS<1:0>: A/D Conversion Clock Select bits

= FOSC/2

= FOSC/8

= FOSC/32

= FRC (clock derived from an RC oscillation)

bit 5:

Reserved

bit 4-3: CHS<1:0>: Analog Channel Select bits

= channel 0, (GP0/AN0)

= channel 1, (GP1/AN1)

= channel 2, (GP2/AN2)

= channel 3, (GP4/AN3)

bit 2:

GO/DONE: A/D Conversion Status bit

If ADON = 1

= A/D conversion in progress (setting this bit starts the A/D conversion)

= A/D conversion not in progress (this bit is automatically cleared by hardware when the A/D conversion

is complete)

bit 1:

Reserved

bit 0:

ADON: A/D on bit

= A/D converter module is operating

= A/D converter module is shut off and consumes no operating current

8.0

ANALOG-TO-DIGITAL

CONVERTER (A/D) MODULE

The Analog-To-Digital (A/D) converter module has four

analog inputs.

The A/D allows conversion of an analog input signal to

a corresponding 8-bit digital number (refer to Applica-

tion Note AN546 for use of A/D Converter). The output

of the sample and hold is the input into the converter,

which generates the result via successive approxima-

tion. The analog reference voltage is software select-

able to either the device’s positive supply voltage (VDD)

or the voltage level on the GP1/AN1/VREF pin. The A/D

converter has a unique feature of being able to operate

while the device is in SLEEP mode.

The A/D module has three registers. These registers

are:

• A/D Result Register (ADRES)

• A/D Control Register 0 (ADCON0)

• A/D Control Register 1 (ADCON1)

The ADCON0 Register, shown in Figure 8-1, controls

the operation of the A/D module. The ADCON1 Regis-

ter, shown in Figure 8-2, configures the functions of the

port pins. The port pins can be configured as analog

inputs (GP1 can also be a voltage reference) or as dig-

ital I/O.

Note 1: If the port pins are configured as analog

inputs (reset condition), reading the port

(MOVF GPIO,W) results in reading '0's.

2: Changing ADCON1 Register can cause

the GPIF and INTF flags to be set in the

INTCON Register.

These interrupts

should be disabled prior to modifying

ADCON1.

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