PIC18F87J93 Microchip Technology, PIC18F87J93 Datasheet - Page 32

• Manufacturer Part Number: PIC18F87J93
• Description: LCD PIC18F Microcontroller
• Manufacturer: Microchip Technology

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PIC18F87J93 FAMILY
The analog reference voltage is software selectable to
either the device’s positive and negative supply voltage
(AV
V
The A/D converter has a unique feature of being able
to operate while the device is in Sleep mode. To
operate 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.
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
FIGURE 2-1:
DS39948A-page 30
REF
DD
+ and RA2/AN2/V
Note 1: Channels AN15 through AN12 are not available on PIC18F6XJ93 devices.
and AV
2: I/O pins have diode protection to V
SS
Converter
12-Bit
) or the voltage level on the RA3/AN3/
A/D
Reference
Voltage
A/D BLOCK DIAGRAM
REF
- pins.
V
V
REF
REF
+
-
(Input Voltage)
VCFG<1:0>
V
(1,2)
AIN
Preliminary
DD
and V
AV
SS
DD
.
A/D conversion. When the A/D conversion is complete,
the result is loaded into the ADRESH:ADRESL register
pair, the GO/DONE bit (ADCON0<1>) is cleared and the
A/D Interrupt Flag bit, ADIF, is set.
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. The value in the
ADRESH:ADRESL register pair is not modified for a
Power-on Reset. These registers will contain unknown
data after a Power-on Reset.
The block diagram of the A/D module is shown in
Figure 2-1.
AV
SS
CHS<3:0>
1011
1010
1001
1000
0111
0110
0101
0100
0011
0010
0001
0000
© 2009 Microchip Technology Inc.
AN11
AN10
AN9
AN8
AN7
AN6
AN5
AN4
AN3
AN2
AN1
AN0