AN2184 Freescale Semiconductor / Motorola, AN2184 Datasheet - Page 13

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

5.3 Multi-Ports Processing
Most of the time, more than one port will be enabled, and in order to make the ISR subroutine more
efficient, several steps should be taken. When the periodic interrupt occurs, the user does not know yet
which port has caused it. To find out, check the following registers:
Figure 9. One-Port Processing Interrupt Service Routine Flow Diagram (Continued)
No
No
No
No
No
No
Freescale Semiconductor, Inc.
B2TUE
DROE
DTUE
B1ROE
B2ROE
B1TUE
For More Information On This Product,
Set?
Set?
Set?
Set?
Set?
Set?
MCF5272 Interrupt Service Routine
Yes
Yes
Yes
Go to: www.freescale.com
Yes
Yes
Yes
Periodic Interrupt Process Multi-Ports Processing
Generate Error
Read PnPSR
Generate Error
Read PnPSR
Generate Error
Read PnPSR
Read PnPSR
Read PnPSR
Read PnPSR
End
13