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参数资料
| 型号： | ST7PLUSA2M3 |
| 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, PDSO8 |
| 封装： | 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8 |
| 文件页数： | 117/136页 |
| 文件大小： | 1705K |
| 代理商： | ST7PLUSA2M3 |
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ST7LITEUS2, ST7LITEUS5
On-chip peripherals
81/136
cycles) and the CADC sample capacitor is disconnected from the analog input pin to get
the optimum analog to digital conversion accuracy.
●
The total conversion time:
tCONV = tSAMPLE + tHOLD
While the ADC is on, these two phases are continuously repeated.
At the end of each conversion, the sample capacitor is kept loaded with the previous
measurement load. The advantage of this behavior is that it minimizes the current
consumption on the analog pin in case of single input channel measurement.
A/D conversion
The analog input ports must be configured as input, no pull-up, no interrupt. Refer to the “I/O
ports” chapter. Using these pins as analog inputs does not affect the ability of the port to be
read as a logic input.
In the ADCCSR register, select the CS[2:0] bits to assign the analog channel to convert.
ADC conversion mode
In the ADCCSR register, set the ADON bit to enable the A/D converter and to start the
conversion. From this time on, the ADC performs a continuous conversion of the selected
channel. When a conversion is complete:
●
The EOC bit is set by hardware.
●
The result is in the ADCDR registers.
A read to the ADCDRH resets the EOC bit.
To read the 10 bits, perform the following steps:
1.
Poll EOC bit
2.
Read ADCDRL
3.
Read ADCDRH. This clears EOC automatically.
To read only 8 bits, perform the following steps:
1.
Poll EOC bit
1.
Read ADCDRH. This clears EOC automatically.
10.3.4
Low power modes
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.
Table 31.
Effect of low power modes
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
can be performed.
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