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FUJITSU SEMICONDUCTOR
CONTROLLER MANUAL
MN705-00009-3v0-E
FR81S
32-BIT MICROCONTROLLER
MB91590 Series
HARDWARE MANUAL
Following URL introduces the information for effective development of Fujitsu Semiconductor microcontrollers.
Helpful information is being released for the customers who are considering, or have adopted our
microcontrollers.
http://edevice.fujitsu.com/micom/en-support/
FUJITSU SEMICONDUCTOR LIMITED

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Preface
MB91590 Series
Thank you for your continued use of Fujitsu semiconductor products.
Read this manual and "Data Sheet" thoroughly before using products in the MB91590 series.
Purpose of this manual and intended readers
This series is Fujitsu 32-bit microcontroller designed for automotive and industrial control. It contains the
FR81S CPU that is compatible with the FR family. The FR81S CPU has a high level performance among
the FR family by enhancing instruction pipeline and load store processing, and improving internal bus
transfer.
It is best suited for application control for automotive.
This manual explains the function, operation, and the usage for the engineer who develops the product by
actually using this series.
Trademark
FR is an abbreviation for the FUJITSU RISC controller, which is a product of Fujitsu Semiconductor
Limited.
The company names and brand names herein are the trademarks or registered trademarks of their respective
owners.
Sample programs and development environment
Fujitsu Semiconductor offers sample programs free of charge for using the peripheral functions of the
FR81S family. Fujitsu Semiconductor also makes available descriptions of the development environment
required for the MB91590 series. Feel free to use them to verify the operational specifications and usage of
this Fujitsu semiconductor microcontroller.
Microcontroller support information:
http://edevice.fujitsu.com/micom/en-support/
* : Note that the sample programs are subject to change without notice. Since they are offered as a way to
demonstrate standard operations and usage, evaluate them sufficiently before running them on your
system.
Fujitsu semiconductor assumes no responsibility for any damage that may occur as a result of using a
sample program.
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MB91590 Series
The contents of this document are subject to change without notice.
Customers are advised to consult with sales representatives before ordering.
The information, such as descriptions of function and application circuit examples, in this document are presented
solely for the purpose of reference to show examples of operations and uses of FUJITSU SEMICONDUCTOR device;
FUJITSU SEMICONDUCTOR does not warrant proper operation of the device with respect to use based on such
information. When you develop equipment incorporating the device based on such information, you must assume any
responsibility arising out of such use of the information. FUJITSU SEMICONDUCTOR assumes no liability for any
damages whatsoever arising out of the use of the information.
Any information in this document, including descriptions of function and schematic diagrams, shall not be construed as
license of the use or exercise of any intellectual property right, such as patent right or copyright, or any other right of
FUJITSU SEMICONDUCTOR or any third party or does FUJITSU SEMICONDUCTOR warrant non-infringement of
any third-party's intellectual property right or other right by using such information. FUJITSU SEMICONDUCTOR
assumes no liability for any infringement of the intellectual property rights or other rights of third parties which would
result from the use of information contained herein.
The products described in this document are designed, developed and manufactured as contemplated for general use,
including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not
designed, developed and manufactured as contemplated (1) for use accompanying fatal risks or dangers that, unless
extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal
injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air
traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for
use requiring extremely high reliability (i.e., submersible repeater and artificial satellite).
Please note that FUJITSU SEMICONDUCTOR will not be liable against you and/or any third party for any claims or
damages arising in connection with above-mentioned uses of the products.
Any semiconductor devices have an inherent chance of failure. You must protect against injury, damage or loss from
such failures by incorporating safety design measures into your facility and equipment such as redundancy, fire
protection, and prevention of over-current levels and other abnormal operating conditions.
Exportation/release of any products described in this document may require necessary procedures in accordance with
the regulations of the Foreign Exchange and Foreign Trade Control Law of Japan and/or US export control laws.
The company names and brand names herein are the trademarks or registered trademarks of their respective owners.
Copyright ©2011 FUJITSU SEMICONDUCTOR LIMITED All rights reserved.
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How to Use This Manual
MB91590 Series
Finding a function
The following methods can be used to search for the explanation of a desired function in this manual:
Search from the table of the contents
The table of the contents lists the manual contents in the order of description.
Search from the register
The register list for this device has been described. You can look up the name of a desired register on the
list to find the address of its location or the page that explains it.
The address where each register is located is not described in the text. To verify the address of a register,
see "B. I/O Map" of "APPENDIX".
Search from the index
You can look up the keyword such as the name of a peripheral function in the index to find the
explanation of the function.
About the chapters
Basically, this manual explains 1 peripheral function per chapter.
Terminology
This manual uses the following terminology.
Term
Word
Half word
Byte
Explanation
Indicates access in units of 32 bits.
Indicates access in units of 16 bits.
Indicates access in units of 8 bits.
How to Read This Manual
Primary Terms
The following explains the primary terms used in this series
Term
Explanation
A 32-bit width, high-speed internal bus.
The bus master is used for access from the CPU (for instruction fetch), the CPU (for
data reading or writing), or the on-chip bus.
XBS The bus slave is used to access to the on-chip bus, RAM (via the XBS built-in wild
register), and flash memory.
The bus has a crossbar switch configuration, and a circuit from each bus master to
each bus slave can operate simultaneously.
On-chip bus
A 32-bit width, high-speed internal bus. It has a 2-layer structure for XBS and DMA, and they
can operate simultaneously.
The bus master of the XBS layer is accessed from the XBS.
The bus master of the DMA layer is accessed from the DMA.
The bus slave of both layers has an external bus interface, CAN, 16/32-bit peripheral bus
bridge and others.
The bus slave of only DMA layer has an access to the XBS.
32-bit peripheral A 32-bit width, low-speed internal bus.
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