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ST6253CB1/XXX Datasheet(PDF) 38 Page - STMicroelectronics |
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ST6253CB1/XXX Datasheet(HTML) 38 Page - STMicroelectronics |
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38 / 84 page  38/84 ST62T53C/T60C/T63C ST62E60C I/O PORTS (Cont’d) 4.1.1 Operating Modes Each pin may be individually programmed as input or output with various configurations. This is achieved by writing the relevant bit in the Data (DR), Data Direction (DDR) and Option reg- isters (OR). Table 10 illustrates the various port configurations which can be selected by user soft- ware. 4.1.1.1 Input Options Pull-up, High Impedance Option. All input lines can be individually programmed with or without an internal pull-up by programming the OR and DR registers accordingly. If the pull-up option is not selected, the input pin will be in the high-imped- ance state. 4.1.1.2 Interrupt Options All input lines can be individually connected by software to the interrupt system by programming the OR and DR registers accordingly. The inter- rupt trigger modes (falling edge, rising edge and low level) can be configured by software as de- scribed in the Interrupt Chapter for each port. 4.1.1.3 Analog Input Options Some pins can be configured as analog inputs by programming the OR and DR registers according- ly. These analog inputs are connected to the on- chip 8-bit Analog to Digital Converter. ONLY ONE pin should be programmed as an analog input at any time, since by selecting more than one input simultaneously their pins will be effectively short- ed. Table 10. I/O Port Option Selection Note: X = Don’t care DDR OR DR Mode Option 0 0 0 Input With pull-up, no interrupt 0 0 1 Input No pull-up, no interrupt 0 1 0 Input With pull-up and with interrupt 0 1 1 Input Analog input (when available) 1 0 X Output Open-drain output (20mA sink when available) 1 1 X Output Push-pull output (20mA sink when available) |
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