ATtiny13A Atmel Corporation, ATtiny13A Datasheet - Page 92

• Manufacturer Part Number: ATtiny13A
• Manufacturer: Atmel Corporation

Specifications of ATtiny13A

• 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: Yes
• Temp. Range (deg C): -40 to 125
• 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

14.11 ADC Conversion Result
14.12 Register Description
14.12.1
92
ATtiny13A
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 92
0x3FF represents the selected reference voltage minus one LSB.
• Bits 7, 4:2 – Res: Reserved Bits
These bits are reserved bits in the ATtiny13A 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
0x07
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.
94.
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
93). 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
8126E–AVR–07/10
ADMUX