PIC16F871 Datasheet

IC型号：
PIC16F871
PDF描述：
28/40-Pin, 8-Bit CMOS FLASH Microcontrollers
文件大小：
1755.40KB
PDF页数：
172页
芯片厂家：
Microchip

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PIC16F870/871

10.0

ANALOG-TO-DIGITAL

CONVERTER (A/D) MODULE

The A/D module has four registers. These registers

are:

鈥?/div>

A/D Result High Register (ADRESH)

A/D Result Low Register (ADRESL)

A/D Control Register0 (ADCON0)

A/D Control Register1 (ADCON1)

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

inputs for the PIC16F870 and eight for the PIC16F871.

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 digital result of this analog level via successive

approximation. 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 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 operate

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

internal RC oscillator.

The ADCON0 register, shown in Register 10-1, 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 the voltage refer-

ence) or as digital I/O.

Additional information on using the A/D module can be

found in the PICmicro鈩?Mid-Range MCU Family Ref-

erence Manual (DS33023).

R/W-0

ADCS1

bit7

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

bit0

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as 鈥?鈥?/div>

- n = Value at POR reset

bit 7-6:

ADCS1:ADCS0: A/D Conversion Clock Select bits

= F

OSC

= F

OSC

= F

OSC

/32

= F

(clock derived from an RC oscillation)

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, (RA5/AN4)

101

= channel 5, (RE0/AN5)

(1)

110

= channel 6, (RE1/AN6)

(1)

111

= channel 7, (RE2/AN7)

(1)

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 conversion is complete)

Unimplemented:

Read as '0'

ADON:

A/D On bit

= A/D converter module is operating

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

bit 5-3:

bit 2:

bit 1:

bit 0:

Note 1:

These channels are not available on the PIC16F870.

漏

1999 Microchip Technology Inc.

Preliminary

DS30569A-page 79

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