REJ09B0467-0100
16
H8S/2456, H8S/2456R, H8S/2454 Group
Hardware Manual
Renesas 16-Bit Single-Chip Microcomputer
H8S Family / H8S/2400 Series
H8S/2456
H8S/2456R
H8S/2454
R4F2456
R4S2456
R4F2456R
R4S2456R
R4F2454
R4S2454
All information contained in this material, including products and product
specifications at the time of publication of this material, is subject to change by
Renesas Technology Corp. without notice. Please review the latest information
published by Renesas Technology Corp. through various means, including the
Renesas Technology Corp. website (http://www.renesas.com).
Rev.1.00
Revision Date: Sep. 19, 2008
Rev. 1.00 Sep. 19, 2008 Page ii of xxx
Notes regarding these materials
1. This document is provided for reference purposes only so that Renesas customers may select the appropriate
Renesas products for their use. Renesas neither makes warranties or representations with respect to the
accuracy or completeness of the information contained in this document nor grants any license to any
intellectual property rights or any other rights of Renesas or any third party with respect to the information in
this document.
2. Renesas shall have no liability for damages or infringement of any intellectual property or other rights arising
out of the use of any information in this document, including, but not limited to, product data, diagrams, charts,
programs, algorithms, and application circuit examples.
3. You should not use the products or the technology described in this document for the purpose of military
applications such as the development of weapons of mass destruction or for the purpose of any other military
use. When exporting the products or technology described herein, you should follow the applicable export
control laws and regulations, and procedures required by such laws and regulations.
4. All information included in this document such as product data, diagrams, charts, programs, algorithms, and
application circuit examples, is current as of the date this document is issued. Such information, however, is
subject to change without any prior notice. Before purchasing or using any Renesas products listed in this
document, please confirm the latest product information with a Renesas sales office. Also, please pay regular
and careful attention to additional and different information to be disclosed by Renesas such as that disclosed
through our website. (http://www.renesas.com )
5. Renesas has used reasonable care in compiling the information included in this document, but Renesas
assumes no liability whatsoever for any damages incurred as a result of errors or omissions in the information
included in this document.
6. When using or otherwise relying on the information in this document, you should evaluate the information in
light of the total system before deciding about the applicability of such information to the intended application.
Renesas makes no representations, warranties or guaranties regarding the suitability of its products for any
particular application and specifically disclaims any liability arising out of the application and use of the
information in this document or Renesas products.
7. With the exception of products specified by Renesas as suitable for automobile applications, Renesas
products are not designed, manufactured or tested for applications or otherwise in systems the failure or
malfunction of which may cause a direct threat to human life or create a risk of human injury or which require
especially high quality and reliability such as safety systems, or equipment or systems for transportation and
traffic, healthcare, combustion control, aerospace and aeronautics, nuclear power, or undersea communication
transmission. If you are considering the use of our products for such purposes, please contact a Renesas
sales office beforehand. Renesas shall have no liability for damages arising out of the uses set forth above.
8. Notwithstanding the preceding paragraph, you should not use Renesas products for the purposes listed below:
(1) artificial life support devices or systems
(2) surgical implantations
(3) healthcare intervention (e.g., excision, administration of medication, etc.)
(4) any other purposes that pose a direct threat to human life
Renesas shall have no liability for damages arising out of the uses set forth in the above and purchasers who
elect to use Renesas products in any of the foregoing applications shall indemnify and hold harmless Renesas
Technology Corp., its affiliated companies and their officers, directors, and employees against any and all
damages arising out of such applications.
9. You should use the products described herein within the range specified by Renesas, especially with respect
to the maximum rating, operating supply voltage range, movement power voltage range, heat radiation
characteristics, installation and other product characteristics. Renesas shall have no liability for malfunctions or
damages arising out of the use of Renesas products beyond such specified ranges.
10. Although Renesas endeavors to improve the quality and reliability of its products, IC products have specific
characteristics such as the occurrence of failure at a certain rate and malfunctions under certain use
conditions. Please be sure to implement safety measures to guard against the possibility of physical injury, and
injury or damage caused by fire in the event of the failure of a Renesas product, such as safety design for
hardware and software including but not limited to redundancy, fire control and malfunction prevention,
appropriate treatment for aging degradation or any other applicable measures. Among others, since the
evaluation of microcomputer software alone is very difficult, please evaluate the safety of the final products or
system manufactured by you.
11. In case Renesas products listed in this document are detached from the products to which the Renesas
products are attached or affixed, the risk of accident such as swallowing by infants and small children is very
high. You should implement safety measures so that Renesas products may not be easily detached from your
products. Renesas shall have no liability for damages arising out of such detachment.
12. This document may not be reproduced or duplicated, in any form, in whole or in part, without prior written
approval from Renesas.
13. Please contact a Renesas sales office if you have any questions regarding the information contained in this
document, Renesas semiconductor products, or if you have any other inquiries.
Rev. 1.00 Sep. 19, 2008 Page iii of xxx
General Precautions in the Handling of MPU/MCU Products
The following usage notes are applicable to all MPU/MCU products from Renesas. For detailed usage notes
on the products covered by this manual, refer to the relevant sections of the manual. If the descriptions under
General Precautions in the Handling of MPU/MCU Products and in the body of the manual differ from each
other, the description in the body of the manual takes precedence.
1. Handling of Unused Pins
Handle unused pins in accord with the directions given under Handling of Unused Pins in the
manual.
The input pins of CMOS products are generally in the high-impedance state. In operation
with an unused pin in the open-circuit state, extra electromagnetic noise is induced in the
vicinity of LSI, an associated shoot-through current flows internally, and malfunctions may
occur due to the false recognition of the pin state as an input signal. Unused pins should
be handled as described under Handling of Unused Pins in the manual.
2. Processing at Power-on
The state of the product is undefined at the moment when power is supplied.
The states of internal circuits in the LSI are indeterminate and the states of register
settings and pins are undefined at the moment when power is supplied.
In a finished product where the reset signal is applied to the external reset pin, the states
of pins are not guaranteed from the moment when power is supplied until the reset
process is completed.
In a similar way, the states of pins in a product that is reset by an on-chip power-on reset
function are not guaranteed from the moment when power is supplied until the power
reaches the level at which resetting has been specified.
3. Prohibition of Access to Reserved Addresses
Access to reserved addresses is prohibited.
The reserved addresses are provided for the possible future expansion of functions. Do
not access these addresses; the correct operation of LSI is not guaranteed if they are
accessed.
4. Clock Signals
After applying a reset, only release the reset line after the operating clock signal has become
stable. When switching the clock signal during program execution, wait until the target clock
signal has stabilized.
When the clock signal is generated with an external resonator (or from an external
oscillator) during a reset, ensure that the reset line is only released after full stabilization of
the clock signal. Moreover, when switching to a clock signal produced with an external
resonator (or by an external oscillator) while program execution is in progress, wait until
the target clock signal is stable.
5. Differences between Products
Before changing from one product to another, i.e. to one with a different part number, confirm
that the change will not lead to problems.
The characteristics of MPU/MCU in the same group but having different part numbers may
differ because of the differences in internal memory capacity and layout pattern. When
changing to products of different part numbers, implement a system-evaluation test for
each of the products.
Rev. 1.00 Sep. 19, 2008 Page iv of xxx
How to Use This Manual
1. Objective and Target Users
This manual was written to explain the hardware functions and electrical characteristics of this
LSI to the target users, i.e. those who will be using this LSI in the design of application
systems. Target users are expected to understand the fundamentals of electrical circuits, logic
circuits, and microcomputers.
This manual is organized in the following items: an overview of the product, descriptions of
the CPU, system control functions, and peripheral functions, electrical characteristics of the
device, and usage notes.
When designing an application system that includes this LSI, take all points to note into
account. Points to note are given in their contexts and at the final part of each section, and
in the section giving usage notes.
The list of revisions is a summary of major points of revision or addition for earlier versions.
It does not cover all revised items. For details on the revised points, see the actual locations
in the manual.
The following documents have been prepared for the H8S/2456, H8S/2456R, H8S/2454
Group. Before using any of the documents, please visit our web site to verify that you have the
most up-to-date available version of the document.
Document Type
Data Sheet
Hardware Manual
Contents
Document Title
Document No.
This manual
Overview of hardware and electrical
characteristics
Hardware specifications (pin
assignments, memory maps,
peripheral specifications, electrical
characteristics, and timing charts)
and descriptions of operation
Detailed descriptions of the CPU
and instruction set
Examples of applications and
sample programs
Preliminary report on the
specifications of a product,
document, etc.
H8S/2456, H8S/2456R
H8S/2454 Group
Hardware Manual
Software Manual
H8S/2600 Series
REJ09B0139
H8S/2000 Series Software
Manual
The latest versions are available from our
web site.
Application Note
Renesas Technical
Update
Rev. 1.00 Sep. 19, 2008 Page v of xxx
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