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ST7263 数据表(PDF) 26 Page - STMicroelectronics |
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ST7263 数据表(HTML) 26 Page - STMicroelectronics |
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26 / 109 page  ST7263 26/109 I/O PORTS (Cont’d) Analog Alternate Function When the pin is used as an ADC input the I/O must be configured as input, floating. The analog multi- plexer (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. 5.1.3 I/O Port Implementation The hardware implementation on each I/O port de- pends on the settings in the DDR register and spe- cific feature of the I/O port such as ADC Input or true open drain. |
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