MC9S08JM60 Datasheet, PDF (34/386 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 2 Pins and Connections
NOTE
When an alternative function is first enabled, it is possible to get a spurious
edge to the module, user software must clear out any associated flags before
interrupts are enabled. Table 2-1 illustrates the priority if multiple modules
are enabled. The highest priority module will have control over the pin.
Selecting a higher priority pin function with a lower priority function
already enabled can cause spurious edges to the lower priority module. It is
recommended that all modules that share a pin be disabled before enabling
another module.
MC9S08JM60 Series Data Sheet, Rev. 2
34
Freescale Semiconductor