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参数资料
| 型号： | ST72621L4M1 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO34 |
| 封装： | 0.300 INCH, LEAD FREE, SHRINK, PLASTIC, SOP-34 |
| 文件页数： | 133/139页 |
| 文件大小： | 1264K |
| 代理商： | ST72621L4M1 |
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Doc ID 6996 Rev 5
10-BIT A/D CONVERTER (ADC) (Cont’d)
To read only 8 bits, perform the following steps:
1. Wait for interrupt or poll the EOC bit
2. Read ADCDRMSB
The EOC bit is reset by hardware once the AD-
CDRMSB is read.
To start another conversion, user should set the
ADON bit once again.
ADC Continuous Conversion mode
In the ADCCSR register:
1.Reset the ONE SHOT bit to put the A/D con-
verter in continuous mode.
2.Set the ADON bit to enable the A/D converter
and to start the first conversion. From this time
on, the ADC performs a continuous conversion
of the selected channel.
Note: Changing the A/D channel during conver-
sion will stop the current conversion and start con-
version of the newly selected channel.
When a conversion is complete:
– The EOC bit is set by hardware.
– An interrupt request is generated if the ITE bit
is set.
– The result is in the ADCDR registers and re-
mains valid until the next conversion has end-
ed.
To read the 10 bits, perform the following steps:
1. Wait for interrupt or poll the EOC bit
2. Read ADCDRLSB
3. Read ADCDRMSB
The EOC bit is reset by hardware once the AD-
CDRMSB is read.
To read only 8 bits, perform the following steps:
1. Wait for interrupt
2. Read ADCDRMSB
The EOC bit is reset by hardware once the AD-
CDRMSB is read.
Changing the conversion channel
The application can change channels during con-
version. In this case the current conversion is
stopped and the A/D converter starts converting
the newly selected channel.
ADCCR consistency
If an End Of Conversion event occurs after soft-
ware 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 sam-
ples.
To guarantee consistency:
– The ADCDRMSB and the ADCDRLSB are
locked when the ADCCRLSB is read
– The ADCDRMSB and the ADCDRLSB are un-
locked when the MSB is read or when ADON
is reset.
Thus, it is mandatory to read the ADCDRMSB just
after reading the ADCDRLSB. This is especially
important in continuous mode, as the ADCDR reg-
ister will not be updated until the ADCDRMSB is
read.
10.7.4 Low Power Modes
Note: The A/D converter may be disabled by re-
setting the ADON bit. This feature allows reduced
power consumption when no conversion is need-
ed and between single shot conversions.
10.7.5 Interrupts
Note: The EOC interrupt event is connected to an
interrupt vector (see Interrupts chapter).
It generates an interrupt if the ITE bit is set in the
ADCCSR register and the interrupt mask in the CC
register is reset (RIM instruction).
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 stabilisation time
tSTAB (see Electrical Characteristics)
before accurate conversions can be
performed.
Interrupt Event
Event
Flag
Enable
Control
Bit
Exit
from
Wait
Exit
from
Halt
End of Conversion
EOC
ITE
Yes
No
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