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ST7LITEUS5 数据表(PDF) 63 Page - STMicroelectronics |
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ST7LITEUS5 数据表(HTML) 63 Page - STMicroelectronics |
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63 / 136 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) ST7LITEUS2, ST7LITEUS5 I/O ports 63/136 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 Unused I/O pins Unused I/O pins must be connected to fixed voltage levels. Refer to Section 12.8. 9.4 Low power modes 9.5 Interrupts The external interrupt event generates an interrupt if the corresponding configuration is selected with DDR and OR registers and the interrupt mask in the CC register is not active (RIM instruction). Table 20. Effect of low power modes on I/O ports Mode Description Wait No effect on I/O ports. External interrupts cause the device to exit from Wait mode. Halt No effect on I/O ports. External interrupts cause the device to exit from Halt mode. Table 21. Description of interrupt events Interrupt event Event flag Enable control bit Exit from Wait Exit from Halt External interrupt on selected external event - DDRx ORx Yes Yes Obsolete Product(s) - Obsolete Product(s) |
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