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PSD913F2 Datasheet(PDF) 52 Page - STMicroelectronics |
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PSD913F2 Datasheet(HTML) 52 Page - STMicroelectronics |
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52 / 91 page  PSD935G2 PSD9XX Family Drive Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Register Port A Open Open Open Open Open Open Open Open Drain Drain Drain Drain Drain Drain Drain Drain Port B Open Open Open Open Open Open Open Open Drain Drain Drain Drain Drain Drain Drain Drain Port C Slew Slew Slew Slew Slew Slew Slew Slew Rate Rate Rate Rate Rate Rate Rate Rate Port D Open Open Open Open Drain Drain Drain Drain Port E Open Open Open Open Open Open Open Open Drain Drain Drain Drain Drain Drain Drain Drain Port G Open Open Open Open Open Open Open Open Drain Drain Drain Drain Drain Drain Drain Drain Table 22. Drive Register Pin Assignment The PSD935G2 Functional Blocks (cont.) 9.4.3.3 Drive Select Register The Drive Select Register configures the pin driver as Open Drain or CMOS for some port pins, and controls the slew rate for the other port pins. An external pull-up resistor should be used for pins configured as Open Drain. A pin can be configured as Open Drain if its corresponding bit in the Drive Select Register is set to a ‘1’. The default pin drive is CMOS. Aside: the slew rate is a measurement of the rise and fall times of an output. A higher slew rate means a faster output response and may create more electrical noise. A pin operates in a high slew rate when the corresponding bit in the Drive Register is set to ‘1’. The default rate is slow slew. Table 22 shows the Drive Register for Ports A, B, C, D, E and G. It summarizes which pins can be configured as Open Drain outputs and which pins the slew rate can be set for. Port F always has CMOS drive. 51 9.4.4 Port Data Registers The Port Data Registers, shown in Table 23, are used by the microcontroller to write data to or read data from the ports. Table 23 shows the register name, the ports having each register type, and microcontroller access for each register type. The registers are described below. 9.4.4.1 Data In Port pins are connected directly to the Data In buffer. In MCU I/O input mode, the pin input is read through the Data In buffer. 9.4.4.2 Data Out Register Stores output data written by the MCU in the MCU I/O output mode. The contents of the Register are driven out to the pins if the Direction Register or the output enable product term is set to “1”. The contents of the register can also be read back by the microcontroller. Register Name Port MCU Access Data In A,B,C,D,E,F,G Read – input on pin Data Out A,B,C,D,E,F,G Write/Read Table 23. Port Data Registers |
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