ATTINY20-XU Atmel, ATTINY20-XU Datasheet - Page 124
ATTINY20-XU
Manufacturer Part Number
ATTINY20-XU
Description
MCU AVR 2KB FLASH 12MHZ 14TSSOP
Manufacturer
Atmel
Series
AVR® ATtinyr
Datasheet
1.ATTINY20-EK1.pdf
(224 pages)
Specifications of ATTINY20-XU
Core Processor
AVR
Core Size
8-Bit
Speed
12MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
12
Program Memory Size
2KB (1K x 16)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Processor Series
ATtiny
Core
AVR
Data Bus Width
8 bit
Data Ram Size
128 B
Interface Type
SPI, TWI
Maximum Clock Frequency
12 MHz
Number Of Programmable I/os
12
Number Of Timers
2
Operating Supply Voltage
3.3 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 85 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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Part Number:
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Manufacturer:
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Quantity:
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15.13 Register Description
15.13.1
124
ATtiny20
ADMUX – ADC Multiplexer Selection Register
• Bit 7 – Res: Reserved Bit
This bit is reserved and will always read as zero.
• Bit 6 – REFS: Reference Selection Bit
This bits selects the voltage reference for the ADC, as shown in
Table 15-3.
If this bit is changed during a conversion, the change will not go in effect until this conversion is
complete (ADIF in ADCSR is set). Also note, that when these bits are changed, the next
conversion will take 25 ADC clock cycles.
• Bit 5 – REFEN
This bit is reserved for QTouch, always write as zero.
• Bit 4 – ADC0EN
This bit is reserved for QTouch, always write as zero.
• Bits 3:0 – MUX[3:0] : Analog Channel and Gain Selection Bits
The value of these bits selects which analog input is connected to the ADC, as shown in
15-4. Selecting channel ADC8 enables temperature measurement.
Table 15-4.
Bit
0x10
Read/Write
Initial Value
Single Ended Input
ADC0 (PA0)
ADC1 (PA1)
ADC2 (PA2)
ADC3 (PA3)
ADC4 (PA4)
ADC5 (PA5)
ADC6 (PA6)
ADC7 (PA7)
0V (AGND)
REFS
0
1
Voltage Reference Selections for ADC
Single-Ended Input channel Selections.
R
7
–
0
Voltage Reference Selection
V
Internal 1.1V voltage reference
REFS
R/W
CC
6
0
used as analog reference
REFEN
R/W
5
0
ADC0EN
R/W
4
0
MUX3
R/W
3
0
MUX2
R/W
2
0
Table
MUX1
R/W
15-3.
1
0
MUX[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
MUX0
R/W
0
0
8235B–AVR–04/11
ADMUX
Table
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