PCM18XT0 Microchip Technology, PCM18XT0 Datasheet - Page 249

• Manufacturer Part Number: PCM18XT0
• Description: MODULE PROC PIC18F4685
• Manufacturer: Microchip Technology

Specifications of PCM18XT0

• Accessory Type: Processor Module
• Product: Microcontroller Modules
• Core Processor: PIC18F4685
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: ICE2000
• For Use With: ICE2000 - EMULATOR MPLAB-ICE 2000 POD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

19.0
The Analog-to-Digital (A/D) converter module has
8 inputs for the PIC18F2682/2685 devices and 11 for
the PIC18F4682/4685 devices. This module allows
conversion of an analog input signal to a corresponding
10-bit digital number.
REGISTER 19-1:
© 2009 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-6
bit 5-2
bit 1
bit 0
Note 1:
U-0
—
2:
10-BIT ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
These channels are not implemented on PIC18F2682/2685 devices.
Performing a conversion on unimplemented channels will return full-scale measurements.
Unimplemented: Read as ‘0’
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)
0110 = Channel 6 (AN6)
0111 = Channel 7 (AN7)
1000 = Channel 8 (AN8)
1001 = Channel 9 (AN9)
1010 = Channel 10 (AN10)
1011 = Unused
1100 = Unused
1101 = Unused
1110 = Unused
1111 = Unused
GO/DONE: A/D Conversion Status bit
When ADON = 1:
1 = A/D conversion in progress
0 = A/D Idle
ADON: A/D On bit
1 = A/D converter module is enabled
0 = A/D converter module is disabled
U-0
—
ADCON0: A/D CONTROL REGISTER 0
W = Writable bit
‘1’ = Bit is set
R/W-0
CHS3
(1,2)
(1,2)
(1,2)
PIC18F2682/2685/4682/4685
R/W-0
CHS2
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-0
CHS1
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 Register 19-1, 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.
R/W-0
CHS0
x = Bit is unknown
GO/DONE
R/W-0
DS39761C-page 249
R/W-0
ADON
bit 0