Datasheet

© 2009 Microchip Technology Inc. DS39755C-page 25
PIC18F2423/2523/4423/4523
2.0 12-BIT ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
The Analog-to-Digital (A/D) Converter module has
10 inputs for the PIC18F2423/2523 devices and 13 for
the PIC18F4423/4523 devices. This module allows
conversion of an analog input signal to a corresponding
12-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)
Of the ADCONx registers:
ADCON0 (shown in Register 2-1) – Controls the
module’s operation
ADCON1 (Register 2-2) – Configures the
functions of the port pins
ADCON2 (Register 2-3) – Configures the A/D
clock source, programmed acquisition time and
justification
REGISTER 2-1: ADCON0: A/D CONTROL REGISTER 0
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
CHS3 CHS2 CHS1 CHS0 GO/DONE ADON
bit 7 bit 0
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
bit 7-6 Unimplemented: Read as ‘0
bit 5-2 CHS<3:0>: 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)
bit 1 GO/DONE
: A/D Conversion Status bit
When ADON =
1:
1 = A/D conversion in progress
0 = A/D Idle
bit 0 ADON: A/D On bit
1 = A/D Converter module is enabled
0 = A/D Converter module is disabled
Note 1: These channels are not implemented on PIC18F2423/2523 devices.
2: Performing a conversion on unimplemented channels will return a floating input measurement.