In SelectMAP boot mode, the MIO pins are configured by the BootROM to use:
- Default drive strength (8 mA)
- Default slew rate (slow)
- Default weak pull-ups (enabled)
- Enables the Schmitt trigger
- Disables the 3-state override
The remaining MIOs are not set by the BootROM and remain at their default state. If a secure lockdown occurs during boot, the BootROM sets the PMC_GLOBAL TRISTATE_OVERRIDE register to force all I/Os into a tristate mode. This register is then reserved for use by the PLM.