PIC18F452-I/L Microchip Technology Inc., PIC18F452-I/L Datasheet - Page 183

• Manufacturer Part Number: PIC18F452-I/L
• Description: 44 PIN, 32 KB FLASH, 1536 RAM, 34 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F452-I/L

• A/d Inputs: 8-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 10 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 36
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 44-pin PLCC
• Programmable Memory: 32K Bytes
• Ram Size: 1.5K Bytes
• Speed: 40 MHz
• Timers: 1-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

17.0
The Analog-to-Digital (A/D) converter module has five
inputs for the PIC18F2X2 devices and eight for the
PIC18F4X2 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 17-1:
© 2006 Microchip Technology Inc.
COMPATIBLE 10-BIT
ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
bit 7-6
bit 5-3
bit 2
bit 1
bit 0
ADCON0 REGISTER
Legend:
R = Readable bit
- n = Value at POR
ADCS1:ADCS0: A/D Conversion Clock Select bits (ADCON0 bits in bold)
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)
110 = channel 6, (AN6)
111 = channel 7, (AN7)
Note: The PIC18F2X2 devices do not implement the full 8 A/D channels; the unimplemented
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
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
bit 7
ADCS1
R/W-0
<ADCS2>
ADCON1
cleared by hardware when the A/D conversion is complete)
0
0
0
0
1
1
1
1
selections are reserved. Do not select any unimplemented channel.
ADCS0
<ADCS1:ADCS0>
R/W-0
ADCON0
00
01
10
11
00
01
10
11
R/W-0
CHS2
W = Writable bit
’1’ = Bit is set
F
F
F
F
F
F
F
F
OSC
OSC
OSC
RC
OSC
OSC
OSC
RC
(clock derived from the internal A/D RC oscillator)
(clock derived from the internal A/D RC oscillator)
/2
/8
/32
/4
/16
/64
R/W-0
CHS1
The A/D module has four registers. These registers
are:
• 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 17-1, con-
trols the operation of the A/D module. The ADCON1
register, shown in Register 17-2, configures the
functions of the port pins.
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
R/W-0
CHS0
Clock Conversion
GO/DONE
R/W-0
PIC18FXX2
x = Bit is unknown
DS39564C-page 181
U-0
—
R/W-0
ADON
bit 0