PIC18FXX39 Datasheet, PDF (181/322 Pages) Microchip Technology – Enhanced FLASH Microcontrollers with Single Phase Induction Motor Control Kernel

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.
REGISTER 18-1: ADCON0 REGISTER
R/W-0
ADCS1
bit 7
R/W-0
ADCS0
R/W-0
CHS2
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.
R/W-0
CHS1
R/W-0
R/W-0
U-0
CHS0 GO/DONE —
R/W-0
ADON
bit 0
bit 7-6 ADCS1:ADCS0: A/D Conversion Clock Select bits (ADCON0 bits in bold)
bit 5-3
bit 2
bit 1
bit 0
ADCON1
ADCON0
<ADCS2> <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)
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.
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
Unimplemented: Read as '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
- n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
 2002-2013 Microchip Technology Inc.
Preliminary
DS30485B-page 181