AN2184 Freescale Semiconductor / Motorola, AN2184 Datasheet - Page 14

• Manufacturer Part Number: AN2184
• Description: MCF5272 Interrupt Service Routine for the Physical Layer Interface Controller
• Manufacturer: Freescale Semiconductor / Motorola

In fact, even if the PLPSR has been updated, the corresponding bit in the PnICR (IE) may not have been
programmed; thus the ISR process cannot be called by this port. The flow chart is shown in Figure 10.
Part VI Aperiodic Interrupt Process
This part describes port sequence, multi-port case, registers, channel sequence, abort condition, and the
command indicate channel.
6.1 Aperiodic One-Port Sequence
This section explains how the aperiodic interrupt is used with one port enabled. The next section describes
a multi-channel approach. When one port is enabled, a level of priority must be set up. For obvious
reasons, the CI channel will be top priority because of its ability to activate and deactivate. As far the
Aperiodic Interrupt Process Aperiodic One-Port Sequence
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1. PnICR: PLIC Interrupt Configuration register
2. PnPSR: PLIC Periodic Status Register
Figure 10. Multi-Port Processing Interrupt Service Routine Flow Diagram
No
No
No
No
Process End
Interrupts
(IE) = 1
(IE) = 1
(IE) = 1
(IE) = 1
P0ICR
P1ICR
P2ICR
P3ICR
ON
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Yes
Yes
Yes
Yes
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No
No
No
No
P0PSR != 0
P1PSR != 0
P2PSR != 0
P3PSR != 0
Yes
Yes
Yes
Yes
Process Port0
Process Port1
Process Port2
Process Port3