PIC16LC926-I/PT 查看數據表（PDF） - Microchip Technology

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PIC16LC926-I/PT

64/68-Pin CMOS Microcontrollers with LCD Driver

Microchip Technology 

PIC16C925/926

10.0 ANALOG-TO-DIGITAL

CONVERTER (A/D) MODULE

The Analog-to-Digital (A/D) Converter module has five

inputs.

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. The A/D conversion of the analog input signal

results in a corresponding 10-bit digital number. The

A/D module has high and low voltage reference input,

that is software selectable to some combination of VDD,

VSS, RA2 or RA3.

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 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 Register 10-1, con-

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

register, shown in Register 10-2, configures the func-

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

as analog inputs (RA3 can also be the voltage refer-

ence), or as digital I/O.

Additional information on using the A/D module can be

found in the PICmicro™ Mid-Range MCU Family

Reference Manual (DS33023).

REGISTER 10-1: ADCON0 REGISTER (ADDRESS: 1Fh)

R/W-0

ADCS1

bit 7

R/W-0

ADCS0

R/W-0

CHS2

R/W-0

CHS1

R/W-0

R/W-0

U-0

CHS0 GO/DONE

—

R/W-0

ADON

bit 0

bit 7-6

bit 5-3

bit 2

bit 1

bit 0

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

00 = FOSC/2

01 = FOSC/8

10 = FOSC/32

11 = FRC (clock derived from the internal A/D module RC oscillator)

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)

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

conversion is complete)

Unimplemented: Read as '0'

ADON: A/D On bit

1 = A/D converter module is operating

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

Legend:

R = Readable bit

- n = Value at POR

W = Writable bit

’1’ = Bit is set

U = Unimplemented bit, read as ‘0’

’0’ = Bit is cleared x = Bit is unknown

 2001 Microchip Technology Inc.

Preliminary

DS39544A-page 75

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