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Line Mode Control

For all the I/O lines, the LineMode feature reports the configuration of the I/O port.

Only the TTL I/O lines have a user-configurable line mode.

A TTLIO can operate as an input or as an output.

When used as input, no configuration is required since at power-up all TTLIO ports are configured as Inputs.

When used as output, the user has the choice between 3 configurations of the line driver. The line driver can be configured in 3 ways:

  • As a totem-pole driver capable of driving low and high.
  • As an open-collector driver capable of driving low only
  • As an open-emitter driver capable of driving high only.

The two latest configurations allows wired-AND configurations.