ATtiny25 Automotive Atmel Corporation, ATtiny25 Automotive Datasheet - Page 126

• Manufacturer Part Number: ATtiny25 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATtiny25 Automotive

• Flash (kbytes): 2 Kbytes
• Pin Count: 8
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 4
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 6
• Ext Interrupts: 6
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.12
• Eeprom (bytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 5
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

18.7.7
18.7.7.1
18.7.7.2
18.7.8
126
ATtiny25/45/85
The ADC Data Register – ADCL and ADCH
ADC Control and Status Register B – ADCSRB
ADLAR = 0
ADLAR = 1
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.
• 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
are supported and the voltage on the positive input must always be larger than the voltage on
the negative input. Otherwise the result is saturated to the voltage reference. In the bipolar mode
two-sided conversions are supported and the result is represented in the two’s complement
form. In the unipolar mode the resolution is 10 bits and the bipolar mode the resolution is 9 bits +
1 sign bit.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
121.
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
R
R
–
6
0
0
R
R
6
0
0
6
0
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
–
4
0
0
R
R
–
4
0
0
R
4
–
0
ADC3
ADC5
11
11
R
R
–
3
0
0
R
R
–
3
0
0
R
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
ADTS1
ADC9
ADC1
ADC3
R/W
R
R
9
1
0
0
R
R
9
–
1
0
0
1
0
ADTS0
ADC8
ADC0
ADC2
R/W
R
R
8
0
0
0
R
R
0
0
8
–
0
0
0
7598H–AVR–07/09
ADCSRB
ADCH
ADCL
ADCH
ADCL