參數(shù)資料
型號： AV80C51T-12R
廠商： TEMIC SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP44
文件頁數(shù)： 163/170頁
文件大?。?/td> 4133K
代理商： AV80C51T-12R
92
ATtiny4/5/9/10 [DATASHEET]
8127F–AVR–02/2013
13.12 Register Description
13.12.1
ADMUX
– ADC Multiplexer Selection Register
Bits 7:2 – Res: Reserved Bits
These bits are reserved and will always read zero.
Bits 1:0 – MUX1:0: Analog Channel Selection Bits
The value of these bits selects which combination of analog inputs are connected to the ADC. See Table 13-2 for
details..
If these bits are changed during a conversion, the change will not go in effect until the conversion is complete
(ADIF in ADCSRA is set)
13.12.2
ADCSRA
– ADC Control and Status Register A
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 con-
version is in progress, will terminate this conversion.
Bit 6 – ADSC: ADC Start Conversion
In Single Conversion mode, write this bit to one to start each conversion. In Free Running mode, write this bit to
one to start the first conversion. The first conversion after ADSC has been written after the ADC has been enabled,
or if ADSC is written at the same time as the ADC is enabled, will take 25 ADC clock cycles instead of the normal
13. This first conversion performs initialization of the ADC.
ADSC will read as one as long as a conversion is in progress. When the conversion is complete, it returns to zero.
Writing zero to this bit has no effect.
Bit 5 – ADATE: ADC Auto Trigger Enable
When this bit is written to one, Auto Triggering of the ADC is enabled. The ADC will start a conversion on a positive
edge of the selected trigger signal. The trigger source is selected by setting the ADC Trigger Select bits, ADTS in
ADCSRB.
Bit
765
4321
0
–
MUX1
MUX0
ADMUX
Read/Write
R
R/W
Initial Value
000
0000
0
Table 13-2.
Input Channel Selections
MUX1
MUX0
Single Ended Input
Pin
0
ADC0
PB0
1
ADC1
PB1
1
0
ADC2
PB2
1
ADC3
PB3
Bit
7
6
543
210
ADEN
ADSC
ADATE
ADIF
ADIE
ADPS2
ADPS1
ADPS0
ADCSRA
Read/Write
R/W
Initial Value
0
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