DM163006 datasheet(193/320 Pages) MICROCHIP

193 / 320 page

 2001 Microchip Technology Inc.

Advance Information

DS39541A-page 193

PIC18C601/801

17.0

10-BIT ANALOG-TO-DIGITAL

CONVERTER (A/D) MODULE

The analog-to-digital (A/D) converter module has 8

inputs for the PIC18C601 devices and 12 for the

PIC18C801 devices. This module has the ADCON0,

ADCON1, and ADCON2 registers.

The A/D allows conversion of an analog input signal

to a corresponding 10-bit digital number.

The A/D 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 Register 17-1, controls

the operation of the A/D module. The ADCON1 register,

shown in Register 17-2, configures the functions of the

port pins. The ADCON2, shown in Register 16-3, config-

ures the A/D clock source 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 00, (AN0)

0001

= channel 01, (AN1)

0010

= channel 02, (AN2)

0011

= channel 03, (AN3)

0100

= channel 04, (AN4)

0101

= channel 05, (AN5)

0110

= channel 06, (AN6)

0111

= channel 07, (AN7)

1000

= channel 08, (AN8)(1)

1001

= channel 09, (AN9)(1)

1010

= channel 10, (AN10)(1)

1011

= channel 11, (AN11)(1)

1100

= Reserved

1101

= Reserved

1110

= Reserved

1111

= Reserved

These channels are not available on the PIC18C601 devices.

bit 1

GO/DONE: A/D Conversion Status bit

When ADON = 1:

= A/D conversion in progress. Setting this bit starts an A/D conversion cycle. This bit is

automatically cleared by hardware when the A/D conversion is complete.

= A/D conversion not in progress

bit 0

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

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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