PIC18F8493 Microchip Technology, PIC18F8493 Datasheet - Page 31

• Manufacturer Part Number: PIC18F8493
• Description: Flash Microcontrollers
• Manufacturer: Microchip Technology

2.0
The Analog-to-Digital (A/D) Converter module converts
an analog input signal to a 12-bit digital number. The
module has 12 inputs for both PIC18F6393/6493 (64-pin)
and PIC18F8393/8493 (80-pin) devices.
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)
REGISTER 2-1:
© 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
—
12-BIT ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
Performing a conversion on unimplemented channels will return a floating input measurement.
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 = Channel 11 (AN11)
1100 = Unimplemented
1101 = Unimplemented
1110 = Unimplemented
1111 = Unimplemented
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)
(1)
(1)
(1)
PIC18F6393/6493/8393/8493
R/W-0
CHS2
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-0
CHS1
The ADCON0 register, shown in Register 2-1, controls
the operation of the A/D module. The ADCON1
register, shown in Register 2-2, configures the
functions of the port pins. The ADCON2 register,
shown in Register 2-3, configures the A/D clock
source, programmed acquisition time and justification.
R/W-0
CHS0
x = Bit is unknown
GO/DONE
R/W-0
DS39896B-page 31
www.DataSheet4U.com
R/W-0
ADON
bit 0