MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
1-17
compare. The MMU may also be configured so that virtual addresses are passed through to the cache as
the physical address untranslated. If the physical address matches a valid cache tag entry, the access hits
in the cache. For a read operation, the cache supplies the data to the processor, and for a write operation,
the data from the processor updates the cache. If the access does not match a valid cache tag entry (misses
in the cache) or a write access must be written through to memory, the cache performs a bus cycle on the
system bus.
1.5.11
SRAM
The MPC5500 family’s internal SRAM module provides a general-purpose 64-Kbyte memory block that
supports mapped read/write accesses from any master. Included within the 64-Kbyte SRAM block is a
32-Kbyte block powered by a separate supply for standby operation, and ECC error correction and
detection.
1.5.12
BAM
The boot assist module (BAM) is a block of read-only memory that is programmed by Freescale and is
identical for all MCUs with an e200z6 core. The BAM program is executed every time the MCU is
powered-on or reset in normal mode. The BAM supports the following four modes of booting:
•
Booting from internal flash memory
•
Single master booting from external memory
•
Multi master booting from external memory with either no arbitration or external arbitration
•
Serial boot loading (a program is downloaded into RAM via eSCI or the FlexCAN and then
executed).
The BAM also reads the reset configuration halfword (RCHW) from flash memory (either internal or
external) and configures the MPC5553 and MPC5554 hardware accordingly.
1.5.13
eMIOS
The enhanced modular I/O system (eMIOS) module provides the functionality to generate or measure time
events. A unified channel (UC) module is employed that provides a superset of the functionality of all the
MIOS channels, while providing a consistent user interface. This allows more flexibility as each unified
channel can be programmed for different functions in different applications. In order to identify up to two
timed events, each UC contains two comparators, a time base selector and registers. This structure is able
to produce match events, which can be configured to measure or generate a waveform. Alternatively, input
events can be used to capture the time base, allowing measurement of an input signal.
1.5.14
eTPU
The enhanced time processing unit (eTPU) is an enhanced co-processor designed for timing control.
Operating in parallel with the CPU, the eTPU processes instructions and real-time input events, performs
output waveform generation, and accesses shared data without host intervention. Consequently, for each
timer event, the CPU setup and service times are minimized or eliminated. In the MPC5554 MCU, two
eTPU engines are grouped together with shared instruction and data RAM to form a powerful time
Summary of Contents for MPC5553
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