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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST7L19 데이터시트(PDF) 47 Page - STMicroelectronics |
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ST7L19 데이터시트(HTML) 47 Page - STMicroelectronics |
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47 / 138 page  ST7L15, ST7L19 47/138 I/O PORTS (cont’d) Analog alternate function Configure the I/O as floating input to use an ADC input. The analog multiplexer (controlled by the ADC registers) switches the analog voltage present on the selected pin to the common analog rail, connected to the ADC input. Analog Recommendations Do not change the voltage level or loading on any I/O while conversion is in progress. Do not 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 maxi- mum ratings. 10.3 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 I/O port features such as ADC input or open drain. Switching these I/O ports from one state to anoth- er should be done in a sequence that prevents un- wanted side effects. Recommended safe transi- tions are illustrated in Figure 30. Other transitions are potentially risky and should be avoided, since they may present unwanted side-effects such as spurious interrupt generation. Figure 30. Interrupt I/O Port State Transitions 10.4 UNUSED I/O PINS Unused I/O pins must be connected to fixed volt- age levels. Refer to section 13.8 on page 113. 10.5 LOW-POWER MODES 10.6 INTERRUPTS The external interrupt event generates an interrupt if the corresponding configuration is selected with DDR and OR registers and if the I bit in the CC register is cleared (RIM instruction). Related Documentation SPI Communication between ST7 and EEPROM (AN970) S/W implementation of I2C bus master (AN1045) Software LCD driver (AN1048) 01 floating/pull-up interrupt INPUT 00 floating (reset state) INPUT 10 open-drain OUTPUT 11 push-pull OUTPUT XX = DDR, OR 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. Interrupt Event Event Flag Enable Control Bit Exit from Wait Exit from Halt External interrupt on selected external event - DDRx ORx Yes Yes 1 |
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