ATA6602-PLQW ATMEL [ATMEL Corporation], ATA6602-PLQW Datasheet - Page 274

• Manufacturer Part Number: ATA6602-PLQW
• Description: Microcontroller with LIN Transceiver, 5V Regulator and Watchdog
• Manufacturer: ATMEL [ATMEL Corporation]

4.21.6
4.21.6.1
274
ATA6602/ATA6603
ADC Conversion Result
ADC Multiplexer Selection Register – ADMUX
After the conversion is complete (ADIF is high), the conversion result can be found in the ADC
Result Registers (ADCL, ADCH).
For single ended conversion, the result is
where V
Table 4-98 on page 274
0x3FF represents the selected reference voltage minus one LSB.
Table 4-98.
ADC
• Bit 7:6 – REFS1:0: Reference Selection Bits
• Bit 5 – ADLAR: ADC Left Adjust Result
• Bit 4 – Res: Reserved Bit
• Bits 3:0 – MUX3:0: Analog Channel Selection Bits
REFS1
Initial Value
Read/Write
These bits select the voltage reference for the ADC, as shown in
changed during a conversion, the change will not go in effect until this conversion is
complete (ADIF in ADCSRA is set). The internal voltage reference options may not be used
if an external reference voltage is being applied to the AREF pin.
The ADLAR bit affects the presentation of the ADC conversion result in the ADC Data Reg-
ister. Write one to ADLAR to left adjust the result. Otherwise, the result is right adjusted.
Changing the ADLAR bit will affect the ADC Data Register immediately, regardless of any
ongoing conversions. For a complete description of this bit (see
ADCL and ADCH” on page
This bit is an unused bit in the ATA6602/ATA6603, and will always read as zero.
The value of these bits selects which analog inputs are connected to the ADC. See
4-99 on page 275
not go in effect until this conversion is complete (ADIF in ADCSRA is set).
0
0
1
1
Bit
=
IN
V
---------------------------- -
IN
is the voltage on the selected input pin and V
V
REFS0
REF
Voltage Reference Selections for ADC
1024
REFS1
0
1
0
1
R/W
7
0
Voltage Reference Selection
AREF, Internal V
AV
Reserved
Internal 1.1V Voltage Reference with external capacitor at AREF pin
for details. If these bits are changed during a conversion, the change will
REFS0
CC
R/W
and
6
0
with external capacitor at AREF pin
Table 4-99 on page
277).
ADLAR
R/W
5
0
ref
turned off
R
4
–
0
275). 0x000 represents analog ground, and
MUX3
R/W
3
0
REF
the selected voltage reference (see
MUX2
R/W
2
0
Table
“The ADC Data Register –
MUX1
R/W
1
0
4-98. If these bits are
MUX0
R/W
0
0
4921C–AUTO–01/07
ADMUX
Table