MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
1-2 Freescale Semiconductor
The system integration unit (SIU) performs several chip-wide configuration functions. Pad configuration
and general-purpose input and output (GPIO) are controlled from the SIU. External interrupts and reset
control are also found in the SIU. The internal multiplexer submodule (SIU_DISR) provides multiplexing
of eQADC trigger sources, daisy chaining the DSPIs, and external interrupt signal multiplexing.
The MPC5553 has a fast Ethernet controller (FEC) with a built-in FIFO and a DMA controller.
Figure 1-1 is a block diagram of the MPC5554 (MPC5500 family MCU), and Figure 1-2 is a block
diagram of the MPC5553.
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