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ST72361AR4-Auto 데이터시트(PDF) 216 Page - STMicroelectronics

부품명 ST72361AR4-Auto
상세설명  Clock, reset and supply management
PDF  279 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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ST72361AR4-Auto 데이터시트(HTML) 216 Page - STMicroelectronics

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10-bit A/D converter (ADC)
ST72361xx-Auto
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Doc ID 12468 Rev 3
17.3.3
Changing the conversion channel
The application can change channels during conversion. When software modifies the
CH[3:0] bits in the ADCCSR register, the current conversion is stopped, the EOC bit is
cleared, and the A/D converter starts converting the newly selected channel.
17.3.4
ADCDR consistency
If an End Of Conversion event occurs after software has read the ADCDRLSB but before it
has read the ADCDRMSB, there would be a risk that the two values read would belong to
different samples.
To guarantee consistency:
●
The ADCDRL and the ADCDRH registers are locked when the ADCCRL is read
●
The ADCDRL and the ADCDRH registers are unlocked when the ADCDRH register is
read or when ADON is reset.
This is important, as the ADCDR register will not be updated until the ADCDRH register is
read.
17.4
Low power modes
Note:
The A/D converter may be disabled by resetting the ADON bit. This feature allows reduced
power consumption when no conversion is needed and between single shot conversions.
17.5
Interrupts
None.
17.6
Register description
17.6.1
Control/status register (ADCCSR)
Read/ write (except bit 7 read only)
Reset value: 0000 0000 (00h)
Table 82.
Effect of low power modes on ADC
Mode
Description
WAIT
No effect on A/D converter
HALT
A/D converter disabled.
After wakeup from Halt mode, the A/D converter requires a stabilization time
tSTAB (see Electrical Characteristics) before accurate conversions can be
performed.
7
0
EOC
SPEED
ADON
SLOW
CH3
CH2
CH1
CH0



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