PIC18F4520ESLASHMLQTP datasheet(225/390 Pages) MICROCHIP

225 / 390 page

 2004 Microchip Technology Inc.

Preliminary

DS39631A-page 223

PIC18F2420/2520/4420/4520

19.0

10-BIT ANALOG-TO-DIGITAL

CONVERTER (A/D) MODULE

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

10 inputs for the 28-pin devices and 13 for the 40/44-pin

devices. This module allows conversion of an analog

input signal to a corresponding 10-bit digital number.

The module has five registers:

• A/D Result High Register (ADRESH)

• A/D Result Low Register (ADRESL)

• A/D Control Register 0 (ADCON0)

• A/D Control Register 1 (ADCON1)

• A/D Control Register 2 (ADCON2)

The ADCON0 register, shown in

controls the operation of the A/D module. The

ADCON1 register, shown in Register 19-2, configures

the functions of the port pins. The ADCON2 register,

shown in Register 19-3, configures the A/D clock

source, programmed acquisition time and justification.

ADCON0 REGISTER

U-0

R/W-0

—

CHS3

CHS2

CHS1

CHS0

GO/DONE

ADON

bit 7

bit 0

bit 7-6

Unimplemented: Read as ‘0’

bit 5-2

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)(1,2)

0110

= Channel 6 (AN6)(1,2)

0111

= Channel 7 (AN7)(1,2)

1000

= Channel 8 (AN8)

1001

= Channel 9 (AN9)

1010

= Channel 10 (AN10)

1011

= Channel 11 (AN11)

1100

= Channel 12 (AN12

1101

= Unimplemented(2)

1110

= Unimplemented(2)

1111

= Unimplemented(2)

Note 1: These channels are not implemented on 28-pin devices.

2: Performing a conversion on unimplemented channels will return a floating input

measurement.

bit 1

GO/DONE: A/D Conversion Status bit

When ADON = 1:

= A/D conversion in progress

= A/D Idle

bit 0

ADON: A/D On bit

= A/D converter module is enabled

= A/D converter module is disabled

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

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