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Фрагмент инструкции
Epson IS energy savings. NOTICE • The material is subject to change without notice. • Any part of this material may not be reproduced or duplicated in any form or any means without the written permission of Seiko Epson. • The information, applied circuit, program, using way etc., written in this material is just for reference. Seiko Epson does not assume any liability for the occurrence of infringing any patent or copyright of third party. This material does not authorize the licence for any patent or intellectual property rights. • Any product described in this material may contain technology or the subject relating to strategic products under the control of the Foreign Exchange and Foreign Trade Law of Japan and may require an export licence from the Ministry of International Trade and industry or other approval from another government agency. • The products (except for some product for automotive applications) listed up on this material are designed to be used with ordinary electronic equipment (OA equipment, AV equipment, communications equipment, measuring instruments etc). Seiko Epson does not assume any liability for the case using the products with the appoication required high reliability or safety extremely (such as aerospace equipment etc). When intending to use any our product with automotive application and the other application than ordinary electronic equipments as above, please contact our sales representatives in advance. RTC - 72421 / 72423 CONTENTS .. Overview............................................................................................. 1 .. Block diagram ..................................................................................... 1 .. Terminal connections.......................................................................... 2 .. Terminal functions............................................................................... 3 .. Characteristics .................................................................................... 4 1. Absolute maximum ratings........................................................................................4 2. Recommended operating conditions.........................................................................4 3. Frequency characteristics and current consumption characteristics.......................... 4 4. Electrical characteristics ( DC characteristics ) ......................................................... 4 .. Switching characteristics (AC characteristics) ........................................... 5 1. When ALE is used .................................................................................................... 5 2. When ALE is fixed at VDD.........................................................................................6 .. Registers............................................................................................. 7 1. Register table............................................................................................................ 7 2. Notes ........................................................................................................................7 3. Functions of register bits (overview).......................................................................... 7 4. Setting the fixed-period pulse output mode and fixed-period interrupt mode............. 8 5. Resetting the fixed-period pulse output mode and fixed-period interrupt mode.........8 .. Register description ............................................................................ 9 1. Timing registers ........................................................................................................ 9 2. CD register (control register D) ............................................................................... 10 3. CE register (control register E)................................................................................ 11 4. CF register (control register F)................................................................................13 .. Using the RTC-72421/RTC-72423 .....................................................14 1. Power-on procedure (initialization)..........................................................................14 2. Read/write of S1 to W registers .............................................................................. 16 3. Write to 30-second ADJ bit ..................................................................................... 16 4. Using the CS1 pin ................................................................................................... 17 .. Power supply circuit example.............................................................17 .. Examples of connection to general-purpose microprocessor.............18 .. External dimensions...........................................................................19 .. Marking layout....................................................................................19 .. Reference data .......
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