attiny25v ATMEL Corporation, attiny25v Datasheet - Page 141
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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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17.13.3
17.13.3.1
17.13.3.2
17.13.4
2586K–AVR–01/08
ADCL and ADCH – The ADC Data Register
ADCSRB – ADC Control and Status Register B
ADLAR = 0
ADLAR = 1
Table 17-5.
When an ADC conversion is complete, the result is found in these two registers.
When ADCL is read, the ADC Data Register is not updated until ADCH is read. Consequently, if
the result is left adjusted and no more than 8-bit precision is required, it is sufficient to read
ADCH. Otherwise, ADCL must be read first, then ADCH.
The ADLAR bit in ADMUX, and the MUXn bits in ADMUX affect the way the result is read from
the registers. If ADLAR is set, the result is left adjusted. If ADLAR is cleared (default), the result
is right adjusted.
• Bits 9:0 - ADC9:0: ADC Conversion Result
These bits represent the result from the conversion, as detailed in
page
• Bit 7 – BIN: Bipolar Input Mode
The gain stage is working in the unipolar mode as default, but the bipolar mode can be selected
by writing the BIN bit in the ADCSRB register. In the unipolar mode only one-sided conversions
Bit
0x05
0x04
Read/Write
Initial Value
Bit
0x05
0x04
Read/Write
Initial Value
Bit
0x03
Read/Write
Initial Value
136.
ADPS2
1
1
1
ADC Prescaler Selections (Continued)
ADC7
ADC9
ADC1
R/W
BIN
15
15
R
R
R
R
–
7
0
0
7
0
0
7
0
ADC6
ADC8
ADC0
ACME
R/W
14
14
ADPS1
R
R
R
R
–
6
0
0
6
0
0
6
0
0
1
1
ADC5
ADC7
R/W
IPR
13
13
R
R
R
R
–
5
0
0
–
5
0
0
5
0
ADC4
ADC6
12
12
R
R
R
R
–
4
0
0
–
4
0
0
–
R
4
0
ADPS0
1
0
1
ADC3
ADC5
11
11
R
R
R
R
R
–
3
0
0
–
3
0
0
3
–
0
ADTS2
ADC2
ADC4
R/W
10
10
R
R
R
R
–
2
0
0
–
2
0
0
2
0
“ADC Conversion Result” on
ATtiny25/45/85
ADTS1
ADC9
ADC1
ADC3
Division Factor
R/W
R
R
R
R
9
1
0
0
9
–
1
0
0
1
0
128
32
64
ADTS0
ADC8
ADC0
ADC2
R/W
R
R
R
R
8
0
0
0
8
–
0
0
0
0
0
ADCSRB
ADCH
ADCL
ADCH
ADCL
141
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