AN2184 Freescale Semiconductor / Motorola, AN2184 Datasheet - Page 21

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

6.6.2 Receive Sequence
The flow chart for the receive sequence is shown in Figure 17.
Part VII Assembly Code
This section outlines how the ColdFire core will handle the PLIC. Some assembly code will be shown to
better describe the sequence flow of the interrupt service routine. An interrupt occurs every 500
microseconds; therefore, all the actions must be performed within this time.
7.1 Interrupt Controller
The MCF5272 microprocessor device has some registers that set the interrupt prioritization levels for each
interrupt source.
The on-chip system integration module contains an interrupt controller that is capable of providing up to
32 interrupt sources.
These sources include the following:
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External interrupt signals INT[6:1]
Software watchdog timer
Four general-purpose timers
Two USARTs
Ethernet controller
PLIC controller
DMA controller
QSPI
USB module
Yes
Freescale Semiconductor, Inc.
Figure 17. CI Receive Sequence Flow Diagram
Read PnGCIR (C3: C0)
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Process End
PASR (GCR)=1
MCF5272 Interrupt Service Routine
PnGCIR
F=1
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No
Silicon Issue
PASR (GCR) = 0
Assembly Code Interrupt Controller
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