參數(shù)資料
型號： MR80C52EXXX-25:RD
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44
封裝： LCC-44
文件頁數(shù)： 168/176頁
文件大小： 2962K
91
2535J–AVR–08/10
ATtiny13
Quantization Error: Due to the quantization of the input voltage into a finite number of codes,
a range of input voltages (1 LSB wide) will code to the same value. Always ± 0.5 LSB.
Absolute Accuracy: The maximum deviation of an actual (unadjusted) transition compared to
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.
14.11 ADC Conversion Result
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 VIN is the voltage on the selected input pin and VREF the selected voltage reference (see
Table 14-2 on page 91 and Table 14-3 on page 92). 0x000 represents analog ground, and
0x3FF represents the selected reference voltage minus one LSB.
14.12 Register Description
14.12.1
ADMUX – ADC Multiplexer Selection Register
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 Table 14-2. If this bit is changed
during a conversion, the change will not go in effect until this conversion is complete (ADIF in
ADCSRA is set).
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 “ADCL and ADCH – The ADC Data Register” on
ADC
VIN 1024
VREF
--------------------------
=
Bit
7
65432
10
–
REFS0
ADLAR
–
MUX1
MUX0
ADMUX
Read/Write
R
R/W
R
R/W
Initial Value
0
00000
00
Table 14-2.
Voltage Reference Selections for ADC
REFS0
Voltage Reference Selection
0VCC used as analog reference.
1
Internal Voltage Reference.
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