ATtiny84 Atmel Corporation, ATtiny84 Datasheet - Page 147

• Manufacturer Part Number: ATtiny84
• Manufacturer: Atmel Corporation

Specifications of ATtiny84

• Flash (kbytes): 8 Kbytes
• Pin Count: 14
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 6
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 12
• Ext Interrupts: 12
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

16.13.2
8006K–AVR–10/10
ADCSRA – ADC Control and Status Register A
Table 16-5.
1.
For offset calibration purpose the offset of the certain differential channels can be measure by
selecting the same input for both negative and positive input. This calibration can be done for
ADC0, ADC3 and ADC7.
level.
• Bit 7 – ADEN: ADC Enable
Writing this bit to one enables the ADC. By writing it to zero, the ADC is turned off. Turning the
ADC off while a conversion is in progress, will terminate this conversion.
Bit
0x06 (0x26)
Read/Write
Initial Value
Positive Differential Input
ADC2 (PA2)
ADC3 (PA3)
ADC4 (PA4)
ADC5 (PA5)
ADC6 (PA6)
ADC7 (PA7)
For offset calibration, only. See
Differential Input channel Selections. (Continued)
ADEN
R/W
7
0
ADSC
R/W
“Operation” on page 133
6
0
Negative Differential Input
ADC1 (PA1)
ADC3 (PA3)
ADC0 (PA0)
ADC1 (PA1)
ADC2 (PA2)
ADC3 (PA3)
ADC4 (PA4
ADC5 (PA5)
ADC6 (PA6)
ADC7 (PA7)
ADC3 (PA3)
ADC5 (PA5)
ADC3 (PA3)
ADC4 (PA4)
ADC6 (PA6)
ADC3 (PA3)
ADC5 (PA5)
ADC7 (PA7)
ADC3 (PA3)
ADC6 (PA6)
ADC7 (PA7)
ADATE
R/W
5
0
“Operation” on page
(1)
(1)
ADIF
R/W
4
0
describes offset calibration in a more detailed
ADIE
R/W
3
0
133.
ADPS2
R/W
2
0
Gain 1x
101100
010000
101010
101110
110000
100100
010010
010100
010110
011000
110010
011010
110100
111010
011100
110110
111100
011110
111000
111110
100110
ATtiny24/44/84
ADPS1
R/W
1
0
MUX5:0
ADPS0
R/W
0
0
Gain 20x
101101
010001
101011
101111
110001
100101
010011
010101
010111
011001
110011
011011
110101
111011
011101
110111
111101
011111
111001
111111
100111
ADCSRA
147