PIC16F819 Datasheet

IC型号：
PIC16F819
PDF描述：
18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Tech...
文件大小：
68.31KB
PDF页数：
176页
芯片厂家：
MICROCHIP

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PIC16F818/819

11.0

ANALOG-TO-DIGITAL

CONVERTER (A/D) MODULE

The A/D module has four registers:

鈥?/div>

A/D Result High Register (ADRESH)

A/D Result Low Register (ADRESL)

A/D Control Register 0 (ADCON0)

A/D Control Register 1 (ADCON1)

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

inputs for 18/20 pin devices.

The conversion of an analog input signal results in a

corresponding 10-bit digital number. The A/D module

has a high and low-voltage reference input that is

software selectable to some combination of V

, V

RA2 or RA3.

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鈥檚 internal RC oscillator.

The ADCON0 register, shown in Register 11-1,

controls the operation of the A/D module. The

ADCON1 register, shown in Register 11-2, configures

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

configured as analog inputs (RA3 can also be a voltage

reference) or a digital I/O.

Additional information on using the A/D module can be

found in the PICmicro

庐

Mid-Range MCU Family

Reference Manual (DS33023).

ADCON0: A/D CONTROL REGISTER 0 (ADDRESS 1Fh)

R/W-0

ADCS1

bit 7

R/W-0

ADCS0

R/W-0

CHS2

R/W-0

CHS1

R/W-0

CHS0

R/W-0

GO/DONE

U-0

鈥?/div>

R/W-0

ADON

bit 0

bit 7-6

ADCS1:ADCS0:

A/D Conversion Clock Select bits

If ADSC2 =

= F

OSC

= F

OSC

= F

OSC

/32

= F

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

If ADSC2 =

= F

OSC

= F

OSC

/16

= F

OSC

/64

= F

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

CHS2:CHS0:

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 (RA4/AN4)

GO/DONE:

A/D Conversion Status bit

If ADON =

= 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)

Unimplemented:

Read as 鈥?鈥?/div>

ADON:

A/D On bit

= A/D converter module is operating

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

Legend:

R = Readable bit

- n = Value at POR

W = Writable bit

鈥?鈥?= Bit is set

U = Unimplemented bit, read as 鈥?鈥?/div>

鈥?鈥?= Bit is cleared

x = Bit is unknown

bit 5-3

bit 2

bit 1

bit 0

铮?/div>

2003 Microchip Technology Inc.

Preliminary

DS39598D-page 81

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