PIC16C765SLASHP datasheet(89/158 Pages) MICROCHIP

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DS41124A-page 89

PIC16C745/765

12.0

ANALOG-TO-DIGITAL

CONVERTER (A/D) MODULE

The 8-bit Analog-To-Digital (A/D) converter module has

five inputs for the PIC16C745 and eight for the

PIC16C765.

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

a corresponding 8-bit digital value. The output of the

sample and hold is the input into the converter, which

generates the result via successive approximation. The

analog reference voltage is software selectable to

either the device’s positive supply voltage (VDD) or the

voltage level on the RA3/AN3/VREF pin.

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

operate while the device is in SLEEP mode. To operate

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

the A/D’s dedicated 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 Register 12-1, con-

trols the operation of the A/D module. The ADCON1

tions of the port pins. The port pins can be configured

as analog inputs (RA3 can also be a voltage reference)

or as digital I/O.

Additional information on using the A/D module can be

found in the PICmicro™ Mid-Range MCU Family Ref-

erence Manual (DS33023) and in Application Note,

AN546.

R/W-0

U-0

R/W-0

ADCS1 ADCS0

CHS2

CHS1

CHS0

GO/DONE

—

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

= FINT/2

= FINT/8

= FINT/32

= FRC (clock derived from dedicated internal oscillator)

bit 5-3:

CHS<2:0>: Analog Channel Select bits

000

= channel 0, (RA0/AN0)

001

= channel 1, (RA1/AN1)

010

= channel 2, (RA2/AN2)

011

= channel 3, (RA3/AN3)

100

= channel 4, (RA5/AN4)

101

= channel 5, (RE0/AN5)(1)

110

= channel 6, (RE1/AN6)(1)

111

= channel 7, (RE2/AN7)(1)

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 conver-

sion is complete)

bit 1:

Unimplemented: Read as '0'

bit 0:

ADON: A/D On bit

= A/D converter module is operating

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

Note 1: A/D channels 5, 6 and 7 are implemented on the PIC16C765 only.

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