Freescale Semiconductor MPC5553 - Features

System Interface Unit (SIU)
MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor 6-3
6.1.3 Features
Features include:
• System configuration
— MCU reset configuration via external pins
— Pad configuration control
• System reset monitoring and generation
— Power-on reset support
— Reset status register providing last reset source to software
— Glitch detection on reset input
— Software controlled reset assertion
• External interrupt
— 16 external interrupt requests, IRQ[0:15], for the MPC5554
15 external interrupt requests, IRQ[0:5, 7:15], for the MPC5553
— Rising- or falling-edge event detection
— Programmable digital filter for glitch rejection
•GPIO
— GPIO function: 214 GPIO I/O pins on the MPC5554; 177 GPIO pins on the MPC5553.
— Dedicated input and output registers for each GPIO pin.
• Internal multiplexing
— Allows serial and parallel chaining of DSPIs
— Allows flexible selection of eQADC trigger inputs
— Allows selection of interrupt requests between external pins and DSPI
6.1.4 Modes of Operation
6.1.5 Normal Mode
In normal mode, the SIU provides the register interface and logic that controls system configuration, the
reset controller, and GPIO. The SIU continues operation with no changes in stop mode.
6.1.6 Debug Mode
SIU operation in debug mode is identical to operation in normal mode.