MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 453

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.5.1.2
To change the vector, priority, polarity, sense or destination of an active (unmasked) interrupt source, the
following sequence should be performed:
Freescale Semiconductor
1. Mask the source using the mask (MSK) bit in the vector/priority register.
2. Wait for the activity (A) bit for that source to be cleared.
3. Make the desired changes.
4. Unmask the source.
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
To avoid having to handle a false interrupt for this case, software can clear
the PIC interrupt pending register of these spurious edge detections by first
configuring the polarity/sense of external interrupt sources to be
level-sensitive; high-level if the input is a positive-edge source, low-level if
it’s a negative-edge source (while the mask bit remains set). After this is
complete, configuring the external interrupt source as edge-sensitive will
not cause a false interrupt.
Changing Interrupt Source Configuration
Programmable Interrupt Controller
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