Manuale d’uso / di manutenzione del prodotto RTC-72423 A del fabbricante Epson
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M Q 162-0 3 Application Manua l Real Time Clock Module RTC-72421/72423 Model Product Number R T C - 72421 A Q4272421 x 000100 R T C - 72421 B Q4272421 x 000200 R T C - 72423 A Q4272423 x 000600 R T C .
N O T I C E • 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.
RTC - 72421 / 72423 CONTENTS Ov ervi ew ............................................................................................. 1 Block diagram ..................................................................................... 1 Term inal connections .
RTC - 72421 / 72423 Page - 1 MQ - 162 - 03 4-BIT PARALLEL INTERFACE REAL TIME CLOCK MODULE RTC - 72421 / 72423 • Built-in crystal unit removes need for adjustment and reduces installation costs • M icroprocessor bus compatible ( tW W, t RD = 120 ns ) • Use of C-M OS IC enables low current consumption ( 5 µ A Max .
RTC - 72421 / 72423 Page - 2 MQ - 162 - 03 Terminal connections RTC-72421 RTC-72423 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 10 11 STD.P CS 0 ALE A 0 A 1 A 2 A 3 RD GND V DD () V DD ( V DD ) CS 1 D 0 1 2 3 WR D D D 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 13 14 STD.
RTC - 72421 / 72423 Page - 3 MQ - 162 - 03 Terminal functions Pin No. Signal RTC-72421 RTC-72423 Input/o u tput Function D 0 -D 3 (Data bus) 11 − 14 14 − 16, 19 Bi- directi on Connect these pines to a bi-directional data bus or CP U data bus. Use this bus to read to and write from the internal counter and registers.
RTC - 72421 / 72423 Page - 4 MQ - 162 - 03 Characteristics 1. Abso lute ma ximu m ratings Item Sy mbol Condition Specificat ion Unit Supply volt age V DD Ta=+25 ° C − 0.3 to 7.0 V Input volt age V I Ta=+25 ° C GND − 0.3 t o V DD +0.3 V Output volt age V O Ta=+25 ° C GND − 0.
RTC - 72421 / 72423 Page - 5 MQ - 162 - 03 Switching characteristics (AC characteristics) 1. W hen ALE is used W rite mode ( V DD =5 V ± 0.5 V, RTC-72421;Ta= − 10 ° C to +70 ° C, RTC-72423;Ta= − 40 ° C to +85 ° C ) Item Symbol Condition Min.
RTC - 72421 / 72423 Page - 6 MQ - 162 - 03 2. W hen ALE is f ix ed at V DD W rite mode ( V DD =5 V ± 0.5 V, RTC-72421;Ta= − 10 ° C to +70 ° C, RTC-72423;Ta= − 40 ° C to +85 ° C ) Item Symbol Condition Min.
RTC - 72421 / 72423 Page - 7 MQ - 162 - 03 Registers 1. Register table Data Address (Hex) A3 A2 A1 A0 Register name D3 D2 D1 D0 Count (BCD) Remarks 0 0 0 0 0 S1 s8 s4 s2 s1 0 to 9 1-second di g it.
RTC - 72421 / 72423 Page - 8 MQ - 162 - 03 4. Setting the fixed-period pulse output m ode and f ixed-period interrupt m ode Mode MASK ITRPT/ST ND ITRPT/STND STD.
RTC - 72421 / 72423 Page - 9 MQ - 162 - 03 Register description 1. Timing r eg isters (1) S1 to Y10 regi s ters These regist ers are 4-bit, posi tive logic regist ers in which the digits of the year, m onth, day, hour, m inute, and s econd are continuous ly w ritten i n B CD code.
RTC - 72421 / 72423 Page - 10 MQ - 162 - 03 2. CD reg ist er (control reg ist er D) (1) HOLD bit (D0) Use the HOLD bit when acc essing the S1 and W regist ers. For details , see "Read/write of S1 t o W regis t ers ". HOLD bit Function HOLD bit 0 The BUSY bit i s alway s 1 (the BU SY status cannot be checked).
RTC - 72421 / 72423 Page - 11 MQ - 162 - 03 IRQ FL AG bit *STD . P pin output 01 0 1 Inte rrupt ge ne ratio n (in sy nchron izati o n wi th co u nt i ncre m e nta ti o n) W riting o f 0 IRQ FLAG b it. The output level s of the STD.P pi n are low (down) and open circuit (up).
RTC - 72421 / 72423 Page - 12 MQ - 162 - 03 2.Fixed-period interrupt m ode (ITRPT/STND=1) 1 1 1 0 0 0 0 Nothing is output bec ause the MASK bit is at 1 Interrupt tim ing Reset at the poi nt at which 0 i s wri tten to the I RF FLAG bit No int errupts ar e generated whil e the M ASK bit is at 1 *STD .
RTC - 72421 / 72423 Page - 13 MQ - 162 - 03 4. CF reg ister (control reg ister F) (1) RESET bi t (D0) W riting 1 to the RESET bit clears the s ub-second bits of t he internal counter down to the 1/256-seconds counter. The reset continues f or as long as the RESET bit is 1.
RTC - 72421 / 72423 Page - 14 MQ - 162 - 03 Using the RTC-72421/RTC-72423 1. Power-on procedure ( init ialization) W hen pow er is turned on, the contents of all regis ters and the output from the S TD.P pin are undefined. Therefore, all the regi ster s mus t be initialized aft er power on.
RTC - 72421 / 72423 Page - 15 MQ - 162 - 03 (A)Starting the count START Set the C F regis ter Reg.F T EST 24/12 ST OP RESET Reg.D 30 s ADJ IR Q F LA G HOLD To nex t pr ocess 0 0 0 0 or 1 0*00B T his s etting is not necessar y when the ST D.
RTC - 72421 / 72423 Page - 16 MQ - 162 - 03 2. Read/write of S1 to W register s Use one of t he procedures shown below to access registers other t han the control regis ters (CD, CE, and CF) while the RTC is operating. Not e t hat the control regi s ters can be acc es sed regardless of t he status of t he BUSY bit.
RTC - 72421 / 72423 Page - 17 MQ - 162 - 03 4. Using t he CS 1 pin The RTC-72421/RTC-72423 has 2 c hip-select si gnal system s: CS 0 and CS1. Us e CS 0 as chip-sel ect for ordinary bus acces s. CS 1 is not onl y us ed for CPU bus cont rol , it also has t he m ain funct i on of s w itchi ng bet w een standby m ode and operating mode.
RTC - 72421 / 72423 Page - 18 MQ - 162 - 03 Examples of connection to general-purpose microprocessor W hen connecting t he RTC-72421/RTC-72423 to a mic roprocessor, caref ully check t he AC timings of both the RTC and the mic roprocessor.
RTC - 72421 / 72423 Page - 19 MQ - 162 - 03 External dimensions 1. RTC-72421 23.1 Max. 6.3 4.2 Max. 2.54 Min. 0.2 Min. 2.54 0.46 7.62 0 - 15 0.25 1.
RTC - 72421 / 72423 Page - 20 MQ - 162 - 03 Reference data [Finding the frequenc y s t ability] 1. Frequency and t em perature charact eri s tics can be approxim ated using the f ol l owing equati ons .
RTC - 72421 / 72423 Page - 21 MQ - 162 - 03 Application notes 1. Notes on handling This module uses a C -MO S IC to realize low power consumption. Carefully note the follow ing cautions when handling.
Application Manual AME RIC A EPSON ELECTRONICS AMERICA , INC. HEA DQUA RTER 150 River Oaks Parkw ay , San Jose, CA 95134, U.S.A. Phone: (1)800-228-3964 (Toll free) : (1)408-922-0200 (Main) Fax: (1)408-922-0238 htt p://www. eea.epson.com A tl anta Office 3010 Roy al Blvd.
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Se non hai ancora comprato il Epson RTC-72423 A è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Epson RTC-72423 A - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Epson RTC-72423 A imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Epson RTC-72423 A ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Epson RTC-72423 A, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Epson RTC-72423 A.
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