Epson RTC-72421 A Spécifications

MQ162-02

RTC - 72421 / 72423 Page - 7 MQ - 162 - 02  Registers 1. Register table Data Address (Hex) A3 A2 A1 A0 Register name D3 D2 D1 D0 Count (BCD) R

RTC - 72421 / 72423 Page - 8 MQ - 162 - 02 4. Setting the fixed-period pulse output mode and fixed-period interrupt mode Mode MASK ITRPT/STND

RTC - 72421 / 72423 Page - 9 MQ - 162 - 02  Register description 1. Timing registers (1) S1 to Y10 registers These registers are 4-bit, posit

RTC - 72421 / 72423 Page - 10 MQ - 162 - 02 2. CD register (control register D) (1) HOLD bit (D0) Use the HOLD bit when accessing the S1 and W

RTC - 72421 / 72423 Page - 11 MQ - 162 - 02 IRQ FLAG bit*STD.P pin output01 0 1Interrupt generation (in synchronizationwith count incrementation

RTC - 72421 / 72423 Page - 12 MQ - 162 - 02 2.Fixed-period interrupt mode (ITRPT/STND=1) 1 1 1 0 0 0 0 Nothing is output because the MASK bit

RTC - 72421 / 72423 Page - 13 MQ - 162 - 02 4. CF register (control register F) (1) RESET bit (D0) Writing 1 to the RESET bit clears the sub-se

RTC - 72421 / 72423 Page - 14 MQ - 162 - 02  Using the RTC-72421/RTC-72423 1. Power-on procedure (initialization) When power is turned on, th

RTC - 72421 / 72423 Page - 15 MQ - 162 - 02 (A)Starting the count STARTSet the CF registerReg.FTEST24/12STOPRESETReg.D30 s ADJIRQ FLAGHOLDTo ne

RTC - 72421 / 72423 Page - 16 MQ - 162 - 02 2. Read/write of S1 to W registers Use one of the procedures shown below to access registers other

NOTICE • No part of this material may be r

RTC - 72421 / 72423 Page - 17 MQ - 162 - 02 4. Using the CS1 pin The RTC-72421/RTC-72423 has 2 chip-select signal systems: CS0 and CS1. Use CS0

RTC - 72421 / 72423 Page - 18 MQ - 162 - 02  Examples of connection to general-purpose microprocessor When connecting the RTC-72421/RTC-72423

RTC - 72421 / 72423 Page - 19 MQ - 162 - 02  External dimensions 1. RTC-72421 23.1 Max.6.34.2Max.2.54Min.0.2Min.2.540.467.620 - 150.251.52 2.

RTC - 72421 / 72423 Page - 20 MQ - 162 - 02  Reference data [Finding the frequency stability] 1. Frequency and temperature characteristics

RTC - 72421 / 72423 Page - 21 MQ - 162 - 02  Application notes 1. Notes on handling This module uses a C-MOS IC to realize low power consump

Application Manual AMERICA EPSON ELECTRONICS AMERICA, INC. HEADQUARTER 150 River Oaks Parkway, San Jose, CA 95134, U.S

RTC - 72421 / 72423 CONTENTS  Overview... 1  Bloc

RTC - 72421 / 72423 Page - 1 MQ - 162 - 02 4-BIT PARALLEL INTERFACE REAL TIME CLOCK MODULE RTC - 72421 / 72423 • Built-in crystal unit removes

RTC - 72421 / 72423 Page - 2 MQ - 162 - 02  Terminal connections RTC-72421 RTC-72423 123456789181716151413121011STD.PCS0ALEA0A1A2A3RDGNDVDD()

RTC - 72421 / 72423 Page - 3 MQ - 162 - 02  Terminal functions Pin No. Signal RTC-72421 RTC-72423 Input/output Function D0-D3 (Data bus) 11−14

RTC - 72421 / 72423 Page - 4 MQ - 162 - 02  Characteristics 1. Absolute maximum ratings Item Symbol Condition Specification Unit Supply volt

RTC - 72421 / 72423 Page - 5 MQ - 162 - 02  Switching characteristics (AC characteristics) 1. When ALE is used Write mode ( VDD=5

RTC - 72421 / 72423 Page - 6 MQ - 162 - 02 2. When ALE is fixed at VDD Write mode ( VDD=5 V ± 0.5 V, RTC-72421;Ta=−10 °C to +70 °