3.2.15 Peripheral Access Controller (PAC)

Using The Library

The Peripheral Access Controller (PAC) provides interface to protect write access to a peripheral's registers to minimize risk of unintended configuration changes as a result of run-away code. The Following operations are provided to manage the peripheral access.

• Clear Protection:

  • This operation will remove the write access protection for the selected peripheral to enable write access

• Set Protection:

  • This operation will set the write access protection for the selected peripheral to disable write access.

• Set and Lock Protection:

  • This operation will set and lock write access protection for the selected peripheral to disable write access. The write protection cannot be cleared until reset occurs.

The CPU Exception will be generated when Peripheral Access Error occurs due to the following:

The example code below demonstrates how to Clear/Set protection for WDTCON peripheral using PAC.

bool status = false;

status = PAC_PeripheralIsProtected(PAC_PERIPHERAL_WDTCON);

if (status == true)
{
    PAC_PeripheralProtectSetup(PAC_PERIPHERAL_WDTCON, PAC_PROTECTION_CLEAR);
}
else
{
    PAC_PeripheralProtectSetup(PAC_PERIPHERAL_WDTCON, PAC_PROTECTION_SET);
}

Library Interface

Peripheral Access Controller peripheral library provides the following interfaces:

Functions

Data types and constants