PIC16LC71-04SLASHSP datasheet(37/176 Pages) MICROCHIP

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DS30272A-page 37

PIC16C71X

FIGURE 7-1:

ADCON0 REGISTER (ADDRESS 08h), PIC16C710/71/711

R/W-0

U-0

R/W-0

ADCS1 ADCS0

— (1)

CHS1

CHS0

GO/DONE

ADIF

ADON

R = Readable bit

W = Writable bit

U = Unimplemented

bit, read as ‘0’

- n =Value at POR reset

bit7

bit0

bit 7-6:

ADCS1:ADCS0: A/D Conversion Clock Select bits

= FOSC/2

= FOSC/8

= FOSC/32

= FRC (clock derived from an RC oscillation)

bit 5:

Unimplemented: Read as '0'.

bit 4-3:

CHS1:CHS0: Analog Channel Select bits

= channel 0, (RA0/AN0)

= channel 1, (RA1/AN1)

= channel 2, (RA2/AN2)

= channel 3, (RA3/AN3)

bit 2:

GO/DONE: A/D Conversion Status bit

If ADON = 1:

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

0 = A/D conversion not in progress (This bit is automatically cleared by hardware when the A/D conver-

sion is complete)

bit 1:

ADIF: A/D Conversion Complete Interrupt Flag bit

1 = conversion is complete (must be cleared in software)

0 = conversion is not complete

bit 0:

ADON: A/D On bit

1 = A/D converter module is operating

0 = A/D converter module is shutoff and consumes no operating current

Note 1: Bit5 of ADCON0 is a General Purpose R/W bit for the PIC16C710/711 only. For the PIC16C71, this bit is

unimplemented, read as '0'.

7.0

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 RA3/AN3/VREF pin.

Applicable Devices

710 71 711 715

The A/D converter has a unique feature of being able

to operate while the device is in SLEEP mode. To oper-

ate in sleep, the A/D conversion clock must be derived

from the A/D’s internal RC oscillator.

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 7-1 and

Figure 7-2, controls the operation of the A/D module.

The ADCON1 register, shown in Figure 7-3 conﬁgures

the functions of the port pins. The port pins can be con-

ﬁgured as analog inputs (RA3 can also be a voltage ref-

erence) or as digital I/O.

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