Cypress Semiconductor /psoc63 /SCB0 /TX_CTRL

Dataframe width. DATA_WIDTH + 1 is the amount of bits in a transmitted data frame. This number does not include start, parity and stop bits. For UART mode, the valid range is [3, 8]. For SPI, the valid range is [3, 15]. For I2C the only valid value is 7.

Least significant bit first (‘0’) or most significant bit first (‘1’). For I2C, this field should be ‘1’.

Each IO cell ‘xxx’ has two associated IP output signals ‘xxx_out_en’ and ‘xxx_out’. ‘0’: Normal operation mode. Typically, this operation mode is used for IO cells that are connected to (board) wires/lines that are driven by a single IO cell. In this operation mode, for an IO cell ‘xxx’ that is used as an output, the ‘xxx_out_en’ output enable signal is typically constant ‘1’ the ‘xxx_out’ output is the outputted value. In other words, in normal operation mode, the ‘xxx_out’ output is used to control the IO cell output value: ‘xxx_out’ is ‘0’ to drive an IO cell output value of ‘0’ and ‘xxx_out’ is ‘1’ to drive an IO cell output value of ‘1’. ‘1’: Open drain operation mode. Typically this operation mode is used for IO cells that are connected to (board) wires/lines that are driven by multiple IO cells (possibly on multiple chips). In this operation mode, for and IO cell ‘xxx’ that is used as an output, the ‘xxx_out_en’ output controls the outputted value. Typically, open drain operation mode drives low/‘0’ and the ‘xxx_out’ output is constant ‘1’. In other words, in open drain operation mode, the ‘xxx_out_en’ output is used to control the IO cell output value: in drive low/‘0’ mode: ‘xxx_out_en’ is ‘1’ (drive enabled) to drive an IO cell output value of ‘0’ and ‘xxx_out_en’ is ‘1’ (drive disabled) to not drive an IO cell output value (another IO cell can drive the wire/line or a pull up results in a wire/line value ‘1’).

The open drain mode is supported for:

• I2C mode, ‘i2c_scl’ and ‘i2c_sda’ IO cells.
• UART mode, ‘uart_tx’ IO cell (SPI slave).
• SPI mode, ‘spi_miso’ IO cell.