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ST7262 数据表(PDF) 33 Page - STMicroelectronics |
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ST7262 数据表(HTML) 33 Page - STMicroelectronics |
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33 / 139 page  ST7262 33/139 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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