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PIC18F4520E/MLQTP Datasheet(PDF) 228 Page - Microchip Technology

Part # PIC18F4520E/MLQTP
Description  28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
PDF  390 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F4520E/MLQTP Datasheet(HTML) 228 Page - Microchip Technology

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PIC18F2420/2520/4420/4520
DS39631A-page 226
Preliminary
 2004 Microchip Technology Inc.
The analog reference voltage is software selectable to
either the device’s positive and negative supply voltage
(VDD and VSS), or the voltage level on the RA3/AN3/
VREF+ and RA2/AN2/VREF-/CVREF pins.
The A/D converter has a unique feature of being able
to operate while the device is in Sleep mode. To oper-
ate in Sleep, the A/D conversion clock must be derived
from the A/D’s internal RC oscillator.
The output of the sample and hold is the input into the
converter, which generates the result via successive
approximation.
A device Reset forces all registers to their Reset state.
This forces the A/D module to be turned off and any
conversion in progress is aborted.
Each port pin associated with the A/D converter can be
configured as an analog input, or as a digital I/O. The
ADRESH and ADRESL registers contain the result of
the A/D conversion. When the A/D conversion is com-
plete, the result is loaded into the ADRESH:ADRESL
register pair, the GO/DONE bit (ADCON0 register) is
cleared and A/D Interrupt Flag bit, ADIF, is set. The block
diagram of the A/D module is shown in Figure 19-1.
FIGURE 19-1:
A/D BLOCK DIAGRAM
(Input Voltage)
VAIN
VREF+
Reference
Voltage
VDD
VCFG1:VCFG0
CHS3:CHS0
AN7(1)
AN6(1)
AN5(1)
AN4
AN3
AN2
AN1
AN0
0111
0110
0101
0100
0011
0010
0001
0000
10-Bit
Converter
VREF-
VSS
A/D
AN12
AN11
AN10
AN9
AN8
1100
1011
1010
1001
1000
Note 1:
Channels AN5 through AN7 are not available on 28-pin devices.
2:
I/O pins have diode protection to VDD and VSS.
0X
1X
X
1
X
0



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