2002 Microchip Technology Inc.
Preliminary
DS30485A-page 181
PIC18FXX39
18.0 COMPATIBLE 10-BIT
ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
The Analog-to-Digital (A/D) converter module has five
inputs for the PIC18F2X39 devices and eight for the
PIC18F4X39 devices. This module has the ADCON0
and ADCON1 register definitions that are compatible
with the mid-range A/D module.
The A/D allows conversion of an analog input signal to
a corresponding 10-bit digital number.
The A/D module has four 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)
The ADCON0 register, shown in Register 18-1, con-
trols the operation of the A/D module. The ADCON1
register, shown in Register 18-2, configures the
functions of the port pins.
REGISTER 18-1:
ADCON0 REGISTER
R/W-0
U-0
R/W-0
ADCS1
ADCS0
CHS2
CHS1
CHS0
GO/DONE
—ADON
bit 7
bit 0
bit 7-6
ADCS1:ADCS0: A/D Conversion Clock Select bits (ADCON0 bits in bold)
bit 5-3
CHS2:CHS0: Analog Channel Select bits
000
= Channel 0 (AN0)
001
= Channel 1 (AN1)
010
= Channel 2 (AN2)
011
= Channel 3 (AN3)
100
= Channel 4 (AN4)
101
= Channel 5 (AN5)(1)
110
= Channel 6 (AN6)(1)
111
= Channel 7 (AN7)(1)
Note 1: These channels are unimplemented on PIC18F2X39 devices. Do not select any
unimplemented channel.
bit 2
GO/DONE: A/D Conversion Status bit
When ADON = 1:
1
= A/D conversion in progress (setting this bit starts the A/D conversion, which is
automatically cleared by hardware when the A/D conversion is complete)
0
= A/D conversion not in progress
bit 1
Unimplemented: Read as '0'
bit 0
ADON: A/D On bit
1
= A/D converter module is powered up
0
= 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
ADCON1
<ADCS2>
ADCON0
<ADCS1:ADCS0>
Clock Conversion
0
00
FOSC/2
0
01
FOSC/8
0
10
FOSC/32
0
11
FRC (clock derived from the internal A/D RC oscillator)
1
00
FOSC/4
1
01
FOSC/16
1
10
FOSC/64
1
11
FRC (clock derived from the internal A/D RC oscillator)
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