Technical Reference Manual 002-29852 Rev. *B
Bits Name SW HW Default or
Enum
Description
16 OPEN_DRAIN RW R 0 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:
- UART mode, 'uart_tx' IO cell.
- SPI mode, 'spi_miso' IO cell.
not applicable to I2C mode, 'i2c_scl' and 'i2c_sda' IO
cells. (I2C SCL/SDA always work in open-drain mode)
TRAVEO™ T2G Automotive MCU: TVII-B-E-4M body controller entry registers
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