參數(shù)資料
型號: M306V5EESP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PDIP64
封裝: 0.750 INCH, PLASTIC, SDIP-64
文件頁數(shù): 12/152頁
文件大?。?/td> 1963K
代理商: M306V5EESP
136
ATtiny25/45/85 [DATASHEET]
2586Q–AVR–08/2013
17.13.2
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 4 – ADIF: ADC Interrupt Flag
This bit is set when an ADC conversion completes and the data registers are updated. The ADC Conversion Com-
plete Interrupt is executed if the ADIE bit and the I-bit in SREG are set. ADIF is cleared by hardware when
executing the corresponding interrupt handling vector. Alternatively, ADIF is cleared by writing a logical one to the
flag. Beware that if doing a Read-Modify-Write on ADCSRA, a pending interrupt can be disabled. This also applies
if the SBI and CBI instructions are used.
Bit 3 – ADIE: ADC Interrupt Enable
When this bit is written to one and the I-bit in SREG is set, the ADC Conversion Complete Interrupt is activated.
Bits 2:0 – ADPS[2:0]: ADC Prescaler Select Bits
These bits determine the division factor between the system clock frequency and the input clock to the ADC.
Bit
7
6
543210
ADEN
ADSC
ADATE
ADIF
ADIE
ADPS2
ADPS1
ADPS0
ADCSRA
Read/Write
R/W
Initial Value
0
000000
Table 17-5.
ADC Prescaler Selections
ADPS2
ADPS1
ADPS0
Division Factor
00
0
2
00
1
2
01
0
4
01
1
8
10
0
16
10
1
32
11
0
64
1
128
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