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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72411R датащи(PDF) 28 Page - STMicroelectronics |
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ST72411R датащи(HTML) 28 Page - STMicroelectronics |
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28 / 71 page  ST72411R 28/71 I/O PORTS (Cont’d) Smartcard versus Standard I/Os The Smartcard I/O ports differ from the standard I/ O ports in that they have a different power supply: the output buffers and the input Schmitt trigger are supplied by VSC_PWR for the Smartcard I/Os and by VDD for the Standard I/Os. For Smartcard I/Os, the Schmitt trigger is designed to guarantee output levels compatible with VDD for VSC_PWR =5V or 3V. Caution: When the SSS regulator is deactivated (bit SSSEN=0), the Smartcard I/O ports cannot be used correctly (VSC_PWR=VSS). In this case, special care is required when manipulating exter- nal interrupts: As Smartcard I/Os are always tied to ground, they may mask interrupts on other I/O lines of the same port. Figure 21. I/O Block Diagram Table 6. Port Mode Options NI - not implemented Off - implemented not activated On - implemented and activated DR DDR OR PAD VDD or VSC_PWR ALTERNATE ENABLE ALTERNATE OUTPUT 1 0 OR SEL DDR SEL DR SEL INTERRUPT PULL-UP CONDITION P-BUFFER (OPTION*) N-BUFFER PULL-UP (OPTION*) 1 0 * SEE TABLE BELOW ANALOG INPUT If implemented ALTERNATE INPUT VDD or VSC_PWR DIODES (OPTION*) PULL-DOWN CONDITION Configura tion Mode Pull-Up P-Buffer Diodes Input Floating Off Off On Pull-up with Interrupt On Output Push-pull Off On Open Drain (logic level) Off Push-pull with pull-up On On Open Drain (logic level) with pull-up Off True Open Drain NI |
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