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25 / 92 page  25/92 ST72E121 ST72T121 I/O PORTS (Cont’d) 4.1.2.4 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. 4.1.3 I/O Port Implementation The hardware implementation on each I/O port de- pends on the settings in the DDR and OR registers and specific feature of the I/O port such as ADC In- put (see Figure 19) 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 il- lustrated in Figure 18. Other transitions are poten- tially risky and should be avoided, since they are likely to present unwanted side-effects such as spurious interrupt generation. Figure 18. Recommended I/O State Transition Diagram with interrupt INPUT OUTPUT no interrupt INPUT push-pull open-drain OUTPUT 25 |
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