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ST72321BXXX-AUTO Datasheet(PDF) 79 Page - STMicroelectronics |
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ST72321BXXX-AUTO Datasheet(HTML) 79 Page - STMicroelectronics |
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79 / 247 page  ST72321Bxxx-Auto I/O ports 79/247 Caution: The alternate function must not be activated as long as the pin is configured as input with interrupt, in order to avoid generating spurious interrupts. Analog alternate function When the pin is used as an ADC input, the I/O must be configured as floating input. The analog multiplexer (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 analog pin. Warning: The analog input voltage level must be within the limits stated in the absolute maximum ratings. 9.3 I/O port implementation The hardware implementation on each I/O port depends on the settings in the DDR and OR registers and specific feature of the I/O port such as ADC Input or true open-drain. Switching these I/O ports from one state to another should be done in a sequence that prevents unwanted side effects. Recommended safe transitions are illustrated in Figure 30. Other transitions are potentially risky and should be avoided, since they are likely to present unwanted side-effects such as spurious interrupt generation. Figure 30. Interrupt I/O port state transitions The I/O port register configurations are summarized in the following table. Table 30. I/O port configuration Port Pin name Input (DDR = 0) Output (DDR = 1) OR = 0 OR = 1 OR = 0 OR = 1 Port A PA7:6 floating true open-drain PA5:4 floating pull-up open-drain push-pull PA3 floating floating interrupt open-drain push-pull PA2:0 floating pull-up interrupt open-drain push-pull 01 floating/pull-up interrupt INPUT 00 floating (reset state) INPUT 10 open-drain OUTPUT 11 push-pull OUTPUT XX = DDR, OR |
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