To all our customers
Regarding the change of names mentioned in the document, such as Mitsubishi
Electric and Mitsubishi XX, to Renesas Technology Corp.
The semiconductor operations of Hitachi and Mitsubishi Electric were transferred to Renesas
Technology Corporation on April 1st 2003. These operations include microcomputer, logic, analog
and discrete devices, and memory chips other than DRAMs (flash memory, SRAMs etc.)
Accordingly, although Mitsubishi Electric, Mitsubishi Electric Corporation, Mitsubishi
Semiconductors, and other Mitsubishi brand names are mentioned in the document, these names
have in fact all been changed to Renesas Technology Corp. Thank you for your understanding.
Except for our corporate trademark, logo and corporate statement, no changes whatsoever have been
made to the contents of the document, and these changes do not constitute any alteration to the
contents of the document itself.
Note : Mitsubishi Electric will continue the business operations of high frequency & optical devices
and power devices.
Renesas Technology Corp.
Customer Support Dept.
April 1, 2003
MITSUBISHI 8-BIT SINGLE-CHIP MICROCOMPUTER
740 FAMILY / 7470 SERIES
7480 Group
7481 Group
User’s Manual
Keep safety first in your circuit designs!
Mitsubishi Electric Corporation puts the maximum effort into making
semiconductor products better and more reliable, but there is always the
possibility that trouble may occur with them. Trouble with semiconductors
may lead to personal injury, fire or property damage. Remember to give due
consideration to safety when making your circuit designs, with appropriate
measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of
non-flammable material or (iii) prevention against any malfunction or mishap.
Notes regarding these materials
These materials are intended as a reference to assist our customers in the
selection of the Mitsubishi semiconductor product best suited to the
customer’s application; they do not convey any license under any
intellectual property rights, or any other rights, belonging to Mitsubishi
Electric Corporation or a third party.
Mitsubishi Electric Corporation assumes no responsibility for any damage,
or infringement of any third-party’s rights, originating in the use of any
product data, diagrams, charts or circuit application examples contained in
these materials.
All information contained in these materials, including product data,
diagrams and charts, represent information on products at the time of
publication of these materials, and are subject to change by Mitsubishi
Electric Corporation without notice due to product improvements or other
reasons. It is therefore recommended that customers contact Mitsubishi
Electric Corporation or an authorized Mitsubishi Semiconductor product
distributor for the latest product information before purchasing a product
listed herein.
Mitsubishi Electric Corporation semiconductors are not designed or
manufactured for use in a device or system that is used under
circumstances in which human life is potentially at stake. Please contact
Mitsubishi Electric Corporation or an authorized Mitsubishi Semiconductor
product distributor when considering the use of a product contained herein
for any specific purposes, such as apparatus or systems for transportation,
vehicular, medical, aerospace, nuclear, or undersea repeater use.
The prior written approval of Mitsubishi Electric Corporation is necessary to
reprint or reproduce in whole or in part these materials.
If these products or technologies are subject to the Japanese export
control restrictions, they must be exported under a license from the
Japanese government and cannot be imported into a country other than
the approved destination.
Any diversion or reexport contrary to the export control laws and
regulations of Japan and/or the country of destination is prohibited.
Please contact Mitsubishi Electric Corporation or an authorized Mitsubishi
Semiconductor product distributor for further details on these materials or
the products contained therein.
Preface
This user’s manual of the Mitsubishi CMOS 8-bit
microcomputer 7480 Group and 7481 Group describes
the hardware specifications and applications in detail.
For software information, refer to
SERIES 740
<SOFTWARE> USER’S MANUAL
, and for
development support tools (assemblers, debuggers,
etc.) refer to the manual attached to each tool, as
well as data book
DEVELOPMENT SUPPORT TOOLS
FOR MICROCOMPUTERS.
BEFORE USING THIS USER’S MANUAL
1. Manual Contents
This user’s manual consists of the following three chapters. Refer to the chapter appropriate to your conditions,
such as hardware design or software development.
q
CHAPTER 1 – HARDWARE
This chapter describes the features of the microcomputers, the operation of their peripherals, and
their electrical characteristics.
CHAPTER 2 – APPLICATIONS
This chapter describes usage of peripheral functions and application examples of the microcomputers,
focusing on the settings of the related registers.
CHAPTER 3 – APPENDICES
This chapter describes all the control register configurations, and the mask ROM confirmation forms
(mask ROM version), the ROM programming confirmation forms (one time PROM version), and the
mark specification forms to be submitted at the ordering.
q
q
2. Register Configurations
An example of control register configurations of the 7480 Group and 7481 Group and the description of
symbols used in them are explained below.
Contents immediately after system is released from reset (Note 1)
b7 b6 b5 b4 b3 b2 b1 b0
Bit
CPU mode register (CPUM) [Address 00FB
16
]
Bit attributes (Note 2)
0 0
b
0
1
2
3
4
5
6
7
Name
Fix these bits to ‘0’
Stack page selection bit
(Note)
Watchdog timer L count
source selection bit
Function
At reset
0
0
R
O
O
O
O
Undefined
W
0
0
O
O
×
×
O
×
0 : Zero page
1 : 1 page
0 : f(X
IN
)/8
1 : f(X
IN
)/16
0
0
Undefined
Not implemented. Writing to this bit is disabled.
This bit is undefined at reading.
Not implemented. Writing to this bit is disabled.
This bit is undefined at reading.
Clock division
ratio selection bit
0 : f(X
IN
)/2 (high-speed mode)
1 : f(X
IN
)/8 (medium-speed mode)
Undefined
Undefined
0
Undefined
O
Undefined
Not implemented. Writing to this bit is disabled.
This bit is undefined at reading.
Note:
In the products whose RAM size is 192 bytes or less, set this bit to ‘0’.
indicates the bit which is not implemented.
Notes 1:
Contents after system is released from reset
0: ‘0’ after system is released from reset
1: ‘1’ after system is released from reset
undefined: undefined after system is released from reset
2:
Bit attributes
R (Read)
O: Read enabled
×:
Read disabled
Undefined: Undefined at reading
0: ‘0’ at reading
1: ‘1’ at reading
W (Write)
O: Write enabled
×:
Write disabled
0: Fixed to ‘0’
∗
: This bit can be set to ‘0’ by software, but cannot be set to ‘1’.
京公网安备 11010802033920号
EEWORLD
