PIC18C242/JW Microchip Technology, PIC18C242/JW Datasheet - Page 167

• Manufacturer Part Number: PIC18C242/JW
• Description: IC MCU EPROM 8KX16 A/D 28CDIP
• Manufacturer: Microchip Technology
• Series: PIC® 18Cr

Specifications of PIC18C242/JW

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: EPROM, UV
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-CDIP (0.300", 7.62mm) Window
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

16.0
The analog-to-digital (A/D) converter module has five
inputs for the PIC18C2x2 devices and eight for the
PIC18C4x2 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 16-1:
2000 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 reset
bit 7
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:
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
ADCS1
<ADCS2>
ADCON1
R/W-0
cleared by hardware when the A/D conversion is complete)
0
0
0
0
1
1
1
1
The PIC18C2X2 devices do not implement the full 8 A/D channels; the unimplemented selections
are reserved. Do not select any unimplemented channel.
<ADCS1:ADCS0>
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 16-1, con-
trols the operation of the A/D module. The ADCON1
register, shown in Register 16-2, configures the func-
tions 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
PIC18CXX2
)
x = Bit is unknown
DS39026C-page 165
U-0
—
R/W-0
ADON
bit 0