(UPD780078 Series) 8-Bit Single-Chip Microcontrollers

User’s Manual µPD780078, 780078Y Subseries 8-Bit Single-Chip Microcontrollers µPD780076 µPD780078 µPD78F0078 µPD780076Y µPD780078Y µPD78F0078Y www.DataSheet4U.com Document No. U14260EJ3V1UD00 (3rd edition) Date Published August 2004 N CP(K) 2000, 2003 Printed in Japan [MEMO] 2 User’s Manual U14260EJ3V1UD 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. 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Purchase of NEC Electronics I2C components conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. 4 User’s Manual U14260EJ3V1UD • The information in this document is current as of August, 2004. The information is subject to change without notice. For actual design-in, refer to the latest publications of NEC Electronics data sheets or data books, etc., for the most up-to-date specifications of NEC Electronics products. Not all products and/or types are available in every country. Please check with an NEC Electronics sales representative for availability and additional information. • No part of this document may be copied or reproduced in any form or by any means without the prior written consent of NEC Electronics. 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Before using any NEC Electronics product in your application, pIease contact the NEC Electronics office in your country to obtain a list of authorized representatives and distributors. They will verify: • • • • • Device availability Ordering information Product release schedule Availability of related technical literature Development environment specifications (for example, specifications for third-party tools and components, host computers, power plugs, AC supply voltages, and so forth) Network requirements • In addition, trademarks, registered trademarks, export restrictions, and other legal issues may also vary from country to country. [GLOBAL SUPPORT] http://www.necel.com/en/support/support.html NEC Electronics America, Inc. (U.S.) Santa Clara, California Tel: 408-588-6000 800-366-9782 NEC Electronics (Europe) GmbH Duesseldorf, Germany Tel: 0211-65030 • Sucursal en España NEC Electronics Hong Kong Ltd. Hong Kong Tel: 2886-9318 NEC Electronics Hong Kong Ltd. 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Novena Square, Singapore Tel: 6253-8311 Taeby, Sweden Tel: 08-63 80 820 • United Kingdom Branch Milton Keynes, UK Tel: 01908-691-133 J04.1 6 User’s Manual U14260EJ3V1UD INTRODUCTION Readers This manual is intended for user engineers who wish to understand the functions of the µPD780078, 780078Y Subseries and design and develop application systems and programs for these devices. µPD780078 Subseries: µPD780076, 780078, 78F0078 µPD780078Y Subseries: µPD780076Y, 780078Y, 78F0078Y Purpose This manual is intended to give users an understanding of the functions described in the Organization below. Organization The µPD780078, 780078Y Subseries manual is separated into two parts: this manual and th