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UPD78F9234のメーカーはNECです、この部品の機能は「(UPD78F9232 / UPD78F9234) 8-Bit Single-Chip Microcontrollers」です。 |
部品番号 | UPD78F9234 |
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部品説明 | (UPD78F9232 / UPD78F9234) 8-Bit Single-Chip Microcontrollers | ||
メーカ | NEC | ||
ロゴ | |||
このページの下部にプレビューとUPD78F9234ダウンロード(pdfファイル)リンクがあります。 Total 70 pages
Preliminary User’s Manual
78K0S/KB1+
8-Bit Single-Chip Microcontrollers
µPD78F9232
µPD78F9234
Document No. U17446EJ1V0UD00 (1st edition)
Date Published April 2005 NS CP(K)
©
Printed in Japan
2005
Free Datasheet http://www.datasheet4u.com/
1 Page NOTES FOR CMOS DEVICES
1 VOLTAGE APPLICATION WAVEFORM AT INPUT PIN
Waveform distortion due to input noise or a reflected wave may cause malfunction. If the input of the
CMOS device stays in the area between VIL (MAX) and VIH (MIN) due to noise, etc., the device may
malfunction. Take care to prevent chattering noise from entering the device when the input level is fixed,
and also in the transition period when the input level passes through the area between VIL (MAX) and
VIH (MIN).
2 HANDLING OF UNUSED INPUT PINS
Unconnected CMOS device inputs can be cause of malfunction. If an input pin is unconnected, it is
possible that an internal input level may be generated due to noise, etc., causing malfunction. CMOS
devices behave differently than Bipolar or NMOS devices. Input levels of CMOS devices must be fixed
high or low by using pull-up or pull-down circuitry. Each unused pin should be connected to VDD or GND
via a resistor if there is a possibility that it will be an output pin. All handling related to unused pins must
be judged separately for each device and according to related specifications governing the device.
3 PRECAUTION AGAINST ESD
A strong electric field, when exposed to a MOS device, can cause destruction of the gate oxide and
ultimately degrade the device operation. Steps must be taken to stop generation of static electricity as
much as possible, and quickly dissipate it when it has occurred. Environmental control must be
adequate. When it is dry, a humidifier should be used. It is recommended to avoid using insulators that
easily build up static electricity. Semiconductor devices must be stored and transported in an anti-static
container, static shielding bag or conductive material. All test and measurement tools including work
benches and floors should be grounded. The operator should be grounded using a wrist strap.
Semiconductor devices must not be touched with bare hands. Similar precautions need to be taken for
PW boards with mounted semiconductor devices.
4 STATUS BEFORE INITIALIZATION
Power-on does not necessarily define the initial status of a MOS device. Immediately after the power
source is turned ON, devices with reset functions have not yet been initialized. Hence, power-on does
not guarantee output pin levels, I/O settings or contents of registers. A device is not initialized until the
reset signal is received. A reset operation must be executed immediately after power-on for devices
with reset functions.
5 POWER ON/OFF SEQUENCE
In the case of a device that uses different power supplies for the internal operation and external
interface, as a rule, switch on the external power supply after switching on the internal power supply.
When switching the power supply off, as a rule, switch off the external power supply and then the
internal power supply. Use of the reverse power on/off sequences may result in the application of an
overvoltage to the internal elements of the device, causing malfunction and degradation of internal
elements due to the passage of an abnormal current.
The correct power on/off sequence must be judged separately for each device and according to related
specifications governing the device.
6 INPUT OF SIGNAL DURING POWER OFF STATE
Do not input signals or an I/O pull-up power supply while the device is not powered. The current
injection that results from input of such a signal or I/O pull-up power supply may cause malfunction and
the abnormal current that passes in the device at this time may cause degradation of internal elements.
Input of signals during the power off state must be judged separately for each device and according to
related specifications governing the device.
Preliminary User’s Manual U17446EJ1V0UD
3
Free Datasheet http://www.datasheet4u.com/
3Pages INTRODUCTION
Target Readers
Purpose
Organization
How to Use This Manual
This manual is intended for user engineers who wish to understand the functions of
the 78K0S/KB1+ in order to design and develop its application systems and programs.
The target devices are the following subseries products.
• 78K0S/KB1+: µPD78F9232, 78F9234
This manual is intended to give users on understanding of the functions described in
the Organization below.
Two manuals are available for the 78K0S/KB1+: this manual and the Instruction
Manual (common to the 78K/0S Series).
78K0S/KB1+
User’s Manual
• Pin functions
• Internal block functions
• Interrupts
• Other internal peripheral functions
• Electrical specifications (target values)
78K/0S Series
Instructions
User’s Manual
• CPU function
• Instruction set
• Instruction description
It is assumed that the readers of this manual have general knowledge of electrical
engineering, logic circuits, and microcontrollers.
◊ To understand the overall functions of 78K0S/KB1+
→ Read this manual in the order of the CONTENTS.
◊ How to read register formats
→ For a bit number enclosed in a square, the bit name is defined as a reserved
word in the RA78K0S, and is defined as an sfr variable using the #pragma sfr
directive in the CC78K0S.
◊ To learn the detailed functions of a register whose register name is known
→ See APPENDIX C REGISTER INDEX.
◊ To learn the details of the instruction functions of the 78K/0S Series
→ Refer to 78K/0S Series Instructions User’s Manual (U11047E) separately
available.
◊ To learn the electrical specifications (target) of the 78K0S/KB1+
→ See CHAPTER 21 ELECTRICAL SPECIFICATIONS (TARGET VALUES).
6 Preliminary User’s Manual U17446EJ1V0UD
Free Datasheet http://www.datasheet4u.com/
6 Page | |||
ページ | 合計 : 70 ページ | ||
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PDF ダウンロード | [ UPD78F9234 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
UPD78F9232 | (UPD78F9232 / UPD78F9234) 8-Bit Single-Chip Microcontrollers | NEC |
UPD78F9234 | (UPD78F9232 / UPD78F9234) 8-Bit Single-Chip Microcontrollers | NEC |