ATtiny13 Atmel Corporation, ATtiny13 Datasheet - Page 91
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ATtiny13
Manufacturer Part Number
ATtiny13
Description
Manufacturer
Atmel Corporation
Specifications of ATtiny13
Flash (kbytes)
1 Kbytes
Pin Count
8
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
6
Ext Interrupts
6
Usb Speed
No
Usb Interface
No
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
No
Crypto Engine
No
Sram (kbytes)
0.06
Eeprom (bytes)
64
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
1
Output Compare Channels
2
Pwm Channels
2
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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14.11 ADC Conversion Result
14.12 Register Description
14.12.1
2535J–AVR–08/10
ADMUX – ADC Multiplexer Selection Register
After the conversion is complete (ADIF is high), the conversion result can be found in the ADC
Result Registers (ADCL, ADCH).
For single ended conversion, the result is
where V
Table 14-2 on page 91
0x3FF represents the selected reference voltage minus one LSB.
• Bit 7 – Res: Reserved Bit
This bit is reserved bit in the ATtiny13 and will always read as zero.
• Bit 6 – REFS0: Reference Selection Bit
This bit selects the voltage reference for the ADC, as shown in
during a conversion, the change will not go in effect until this conversion is complete (ADIF in
ADCSRA is set).
Table 14-2.
• 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 complete description of this bit, see
page
Bit
Read/Write
Initial Value
• Quantization Error: Due to the quantization of the input voltage into a finite number of codes,
• Absolute Accuracy: The maximum deviation of an actual (unadjusted) transition compared to
a range of input voltages (1 LSB wide) will code to the same value. Always ± 0.5 LSB.
an ideal transition for any code. This is the compound effect of offset, gain error, differential
error, non-linearity, and quantization error. Ideal value: ± 0.5 LSB.
93.
IN
is the voltage on the selected input pin and V
REFS0
Voltage Reference Selections for ADC
0
1
R
7
–
0
REFS0
and
R/W
6
0
Table 14-3 on page
ADLAR
Voltage Reference Selection
V
Internal Voltage Reference.
R/W
CC
5
0
used as analog reference.
ADC
=
R
4
–
0
V
--------------------------
IN
“ADCL and ADCH – The ADC Data Register” on
V
⋅
REF
1024
92). 0x000 represents analog ground, and
R
3
–
0
REF
the selected voltage reference (see
R
2
–
0
Table
MUX1
14-2. If this bit is changed
R/W
1
0
MUX0
R/W
0
0
ADMUX
91