PIC18F8493 Microchip Technology, PIC18F8493 Datasheet - Page 34

• Manufacturer Part Number: PIC18F8493
• Description: Flash Microcontrollers
• Manufacturer: Microchip Technology

PIC18F6393/6493/8393/8493
The analog reference voltage is software selectable to
either the device’s positive and negative supply voltage
(V
V
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.
FIGURE 2-1:
DS39896B-page 34
REF
DD
+/SEG17 and RA2/AN2/V
and V
Note 1:
SS
), or the voltage level on the RA3/AN3/
Converter
12-Bit
I/O pins have diode protection to V
A/D
Reference
Voltage
A/D BLOCK DIAGRAM
REF
-/SEG16 pins.
V
V
REF
REF
+
-
(Input Voltage)
VCFG1:VCFG0
V
AIN
DD
and V
X
X
1
0
AV
0
1
X
X
SS
DD
diagram of the A/D module is shown in Figure 2-1.
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 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<1>) is cleared
and the A/D Interrupt Flag bit, ADIF, is set. The block
.
(1)
AV
SS
(1)
CHS3:CHS0
1011
1010
1001
1000
0111
0110
0101
0100
0011
0010
0001
0000
© 2009 Microchip Technology Inc.
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