attiny25v ATMEL Corporation, attiny25v Datasheet - Page 139
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attiny25v
Manufacturer Part Number
attiny25v
Description
Microcontroller With 2/4/8k Bytes In-system Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.ATTINY25V.pdf
(231 pages)
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2586K–AVR–01/08
• Bit 5 – ADLAR: ADC Left Adjust Result
The ADLAR bit affects the presentation of the ADC conversion result in the ADC Data Register.
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 conver-
sions. For a comple te description of this bit, see
on page
• Bits 3:0 – MUX3:0: Analog Channel and Gain Selection Bits
The value of these bits selects which combination of analog inputs are connected to the ADC. In
case of differential input (ADC0 - ADC1 or ADC2 - ADC3), gain selection is also made with these
bits. Selecting ADC2 or ADC0 as both inputs to the differential gain stage enables offset mea-
surements. Selecting the single-ended channel ADC4 enables the temperature sensor. Refer to
Table 17-4
effect until this conversion is complete (ADIF in ADCSRA is set).
Table 17-4.
1.
2.
MUX3..0
0101
0000
0001
0010
0011
0100
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
For offset calibration, only.
For temperature sensor.
141.
(1)
for details. If these bits are changed during a conversion, the change will not go into
Input Channel Selections
Single Ended
ADC0 (PB5)
ADC1 (PB2)
ADC2 (PB4)
ADC3 (PB3)
ADC4
Input
GND
N/A
V
N/A
BG
(2)
See “Operation” on page 127.
Differential Input
ADC2 (PB4)
ADC2 (PB4)
ADC2 (PB4)
ADC2 (PB4)
ADC0 (PB5)
ADC0 (PB5)
ADC0 (PB5)
ADC0 (PB5)
Positive
“ADCL and ADCH – The ADC Data Register”
Differential Input
ADC2 (PB4)
ADC2 (PB4)
ADC3 (PB3)
ADC3 (PB3)
ADC0 (PB5)
ADC0 (PB5)
ADC1 (PB2)
ADC1 (PB2)
Negative
N/A
N/A
ATtiny25/45/85
Gain
20x
20x
20x
20x
1x
1x
1x
1x
139
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