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CONTENTS

■ Overview---------------------------------------------------------------------------------------------------1

■ Block diagram --------------------------------------------------------------------------------------------2

■ Pin connections ------------------------------------------------------------------------------------------2

■ Pin functions ----------------------------------------------------------------------------------------------3

■ Characteristics--------------------------------------------------------------------------------------------4

1. Absolute maximum ratings ------------------------------------------------------------------------------------------------4

2. Operating conditions --------------------------------------------------------------------------------------------------------4

3. Frequency characteristics and current consumption characteristics -------------------------------------------4

4. Electrical characteristics (DC characteristics) ------------------------------------------------------------------------5

■ Switching characteristics (AC characteristics) ---------------------------------------------------6

1. When ALE is used-----------------------------------------------------------------------------------------------------------6

2. When ALE is fixed at VDD--------------------------------------------------------------------------------------------------8

■ Registers---------------------------------------------------------------------------------------------------9

1. Register table -----------------------------------------------------------------------------------------------------------------9

2. Notes----------------------------------------------------------------------------------------------------------------------------9

3. Functions of register bits (overview) ----------------------------------------------------------------------------------10

4. Setting the fixed-period pulse output mode and fixed-period interrupt mode-------------------------------10

5. Resetting the fixed-period pulse output mode and fixed-period interrupt mode----------------------------10

■ Register description -----------------------------------------------------------------------------------11

1. Timing registers-------------------------------------------------------------------------------------------------------------11

(1) S1 to Y10 registers------------------------------------------------------------------------------------------------------11

(2) W register ----------------------------------------------------------------------------------------------------------------11

(3) H10 register (PM/AM, h20, h10)---------------------------------------------------------------------------------------11

(4) Y1 and Y10 registers ---------------------------------------------------------------------------------------------------11

(5) Out-of-range data ------------------------------------------------------------------------------------------------------11

2. CD register (control register D)-------------------------------------------------------------------------------------------12

(1) HOLD bit (D0) -----------------------------------------------------------------------------------------------------------12

(2) BUSY bit (D1)------------------------------------------------------------------------------------------------------------12

(3) IRQ FLAG bit (D2)------------------------------------------------------------------------------------------------------12

(4) 30-second ADJ bit (D3) -----------------------------------------------------------------------------------------------13

3. CE register (control register E)-------------------------------------------------------------------------------------------13

(1) MASK bit (D0) -----------------------------------------------------------------------------------------------------------13

(2) ITRPT/STND bit (D1) --------------------------------------------------------------------------------------------------14

(3) t0 (D2), t1 (D3) bits ------------------------------------------------------------------------------------------------------14

4. CF register (control register F) ------------------------------------------------------------------------------------------15

(1) RESET bit (D0)----------------------------------------------------------------------------------------------------------15

(2) STOP bit (D1)------------------------------------------------------------------------------------------------------------15

(3) 24/12 bit (D2) ------------------------------------------------------------------------------------------------------------15

(4) TEST bit (D3) ------------------------------------------------------------------------------------------------------------15

Epson RTC-72421 User Manual

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