Overview
MPC5606S Microcontroller Reference Manual, Rev. 7
Freescale Semiconductor 71
1.8 Using the MPC5606S
There are many different approaches to designing a system using the MPC5606S, so the guidance in this
section is provided as an example of how the documents can be applied to this task.
Familiarity with the MPC5606S modules can help ensure that its features are being optimally used in a
system design. Therefore, the current chapter is a good starting point. Further information on the detailed
features of each module are provided within the module chapters. These, combined with the current
chapter, should provide a good introduction to the functions available on the MCU.
1.8.1 Hardware design
The MPC5606S requires that certain pins be connected to particular power supplies, system functions, and
other voltage levels for operation.
The MPC5606S internal logic operates from 1.2 V (nominal) supplies that are normally supplied by the
on-chip voltage regulator from a 5 V or 3.3 V supply. The 5 V and 3.3 V supplies are also used to supply
the input/output pins on the MCU. This means that different input/output ports can operate at different
voltages simultaneously. Chapter 3, Signal Description, describes the power supply pin names, numbers,
and their purposes. For more detail on the voltage supply of each pin, see Chapter 40, Voltage Regulators
and Power Supplies; that chapter also describes the use of the required external ballast transistor to
generate the 1.2 V. For specifications of the voltage ranges and limits and decoupling of the power
supplies, see the MPC5606S Microcontroller Data Sheet.
Certain pins have dedicated functions that affect the behavior of the MCU after reset. These include pins
to force test or alternate boot conditions and debug features. These are described in Chapter 3, Signal
Description, and a hardware designer should take care that these pins are connected to ensure correct
operation.
Beyond power supply and pins that have special functions, there are also pins that have special system
purposes such as oscillator and reset pins. These are also described in
Chapter 3, Signal Description. The
reset pin is bidirectional and its function is closely tied to the reset generation module [Chapter 31, Reset
Generation Module (MC_RGM)]. The crystal oscillator pins are dedicated to this function but the
oscillator is not started automatically after reset. The oscillator module is described in Chapter 8, Clock
Description, along with the internal clock architecture and the other oscillator sources on-chip.
1.8.2 Input/output pins
The majority of the pins on the MCU are input/output pins that may either operate as general purpose pins
or be connected to a particular on-chip module. The arrangement allows a function to be available on
several pins. The system designer should allocate the function for the pin before connecting to external
hardware. The software should then choose the correct function to match the hardware. The pad
characteristics can vary depending on the functions on the pad.
Chapter 3, Signal Description, describes
each pad type (for example, SLOW, M1, or SMD). Two pads may be able to carry the same function but
1
To find the address of a register in a particular module take the start address of the module given in the memory
map and add the offset for the register given in the module chapter.
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