参数资料
型号: ST72621K4B1
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, PDIP32
封装: 0.400 INCH, LEAD FREE, SHRINK, PLASTIC, DIP-32
文件页数: 67/139页
文件大小: 1264K
代理商: ST72621K4B1
ST7262xxx
33/139
Doc ID 6996 Rev 5
I/O PORTS (Cont’d)
Analog Alternate Functions
When the pin is used as an ADC input, the I/O
must be configured as input. The analog multiplex-
er (controlled by the ADC registers) switches the
analog voltage present on the selected pin to the
common analog rail which is connected to the
ADC input.
It is recommended not to change the voltage level
or loading on any port pin while conversion is in
progress. Furthermore it is recommended not to
have clocking pins located close to a selected an-
alog pin.
Warning: The analog input voltage level must be
within the limits stated in the Absolute Maximum
Ratings.
9.2.4 I/O Port Implementation
The hardware implementation on each I/O port de-
pends on the settings in the DDR register and spe-
cific features of the I/O port such as ADC Input or
true open drain.
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