3231h Flex IO Configuration

Defines how the pins (inputs/outputs 1 … 4) of the device are used.

Each bit in the respective subindex corresponds to a pin, whereby the first pin configures DIO1, the second pin DIO2, etc.

• Pin 1: DIO1_IO_CS
• Pin 2: DIO2_CD_CLK
• Pin 3: DIO3_CD_DIR
• Pin 4: DIO4_IO_MOSI

• Subindex 03_h Alternate Function Mask: This bit mask defines whether the alternative function of the pin is to be activated.

  To activate an alternative function, set the corresponding bit to "1":

  Bit	Pin	Alternative function
  1	DIO2_CD_CLK	Clock input in clock-direction mode
  2	DIO3_CD_DIR	Direction input in clock-direction mode

  Note:

  If you do not activate the alternative function, you can no longer use the corresponding pin as a normal input/output.

  If the Clock-direction mode is activated, the pins for clock and direction are automatically configured accordingly and the settings in 3231_h are overwritten.

• Subindex 01_h Output Mask: This bit mask defines whether the pin is used as input or output (depending on whether an alternative function was activated for the pin in subindex 03_h):
  • Bit = "0": Pin is input (default)
  • Bit = "1": Pin is output

• Subindex 02_h Pullup Mask: This bit mask defines whether the pin is a pullup or pulldown:

  • Bit = "0": Pin is pulldown (default)
  • Bit = "1": Pin is pullup

  Subindex 02_h is only active for the pin if it is defined as an input.

Example for subindex 01_h: Pin 2 and pin 3 are to be outputs, value = "6" (=0110 _b)