PIC17C752-08SLASHCL datasheet(177/328 Pages) MICROCHIP

177 / 328 page

DS30289A-page 177

PIC17C7XX

16.0

ANALOG-TO-DIGITAL

CONVERTER (A/D) MODULE

The analog-to-digital (A/D) converter module has

twelve analog inputs for the PIC17C75X devices and

sixteen for the PIC17C76X devices.

The analog input charges a sample and hold capacitor.

The output of the sample and hold capacitor is the input

into the converter. The converter then generates a dig-

ital result of this analog level via successive approxima-

tion. This A/D conversion, of the analog input signal,

results in a corresponding 10-bit digital number.

The analog reference voltages (positive and negative

supply) are software selectable to either the device’s

supply voltages (AVDD, AVss) or the voltage level on

the RG3/AN0/VREF+ and RG2/AN1/VREF- pins.

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 clock must be derived from the

A/D’s internal RC oscillator.

The A/D module has four registers. These registers

are:

• A/D Result High Register (ADRESH)

• A/D Result Low Register (ADRESL)

• A/D Control Register0 (ADCON0)

• A/D Control Register1 (ADCON1)

The ADCON0 register, shown in Figure 16-1, controls

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

ter, shown in Figure 16-2, conﬁgures the functions of

the port pins. The port pins can be conﬁgured as ana-

log inputs (RG3 and RG2 can also be the voltage refer-

ences) or as digital I/O.

FIGURE 16-1: ADCON0 REGISTER (ADDRESS: 14h, BANK 5)

R/W-0

U-0

R/W-0

U-0

R/W-0

CHS3

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 7-4: CHS3:CHS0: Analog Channel Select bits

0000

= channel 0, (AN0)

0001

= channel 1, (AN1)

0010

= channel 2, (AN2)

0011

= channel 3, (AN3)

0100

= channel 4, (AN4)

0101

= channel 5, (AN5)

0110

= channel 6, (AN6)

0111

= channel 7, (AN7)

1000

= channel 8, (AN8)

1001

= channel 9, (AN9)

1010

= channel 10, (AN10)

1011

= channel 11, (AN11)

1100

= channel 12, (AN12) (PIC17C76X only)

1101

= channel 13, (AN13) (PIC17C76X only)

1110

= channel 14, (AN14) (PIC17C76X only)

1111

= channel 15, (AN15) (PIC17C76X only)

11xx

= RESERVED, do not select (PIC17C75X only)

bit 3:

Unimplemented: Read as '0'

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 which is automatically cleared

by hardware when the A/D conversion is complete)

0 = A/D conversion not in progress

bit 1:

Unimplemented: Read as '0'

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

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