User ManualTable of Contents Overview1 Block diagram1 Terminal connections2 Terminal functions3 Characteristics41. Absolute maximum ratings42. Recommended operating conditions43. Frequency characteristics and current consumption characteristics44. Electrical characteristics ( DC characteristics )4 Switching characteristics (AC characteristics)51. When ALE is used52. When ALE is fixed at VDD6 Registers71. Register table72. Notes73. Functions of register bits (overview)74. Setting the fixed-period pulse output mode and fixed-period interrupt mode85. Resetting the fixed-period pulse output mode and fixed-period interrupt mode8 Register description91. Timing registers92. CD register (control register D)103. CE register (control register E)114. CF register (control register F)13 Using the RTC-72421/RTC-72423141. Power-on procedure (initialization)142. Read/write of S1 to W registers163. Write to 30-second ADJ bit164. Using the CS1 pin17 Power supply circuit example17 Examples of connection to general-purpose microprocessor18 External dimensions19 Marking layout19 Reference data20 Application notes211. Notes on handling212. Notes on packaging21Size: 205 KBPages: 25Language: EnglishOpen manual
User ManualTable of Contents Overview1 Block diagram1 Terminal connections2 Terminal functions3 Characteristics41. Absolute maximum ratings42. Recommended operating conditions43. Frequency characteristics and current consumption characteristics44. Electrical characteristics ( DC characteristics )4 Switching characteristics (AC characteristics)51. When ALE is used52. When ALE is fixed at VDD6 Registers71. Register table72. Notes73. Functions of register bits (overview)74. Setting the fixed-period pulse output mode and fixed-period interrupt mode85. Resetting the fixed-period pulse output mode and fixed-period interrupt mode8 Register description91. Timing registers92. CD register (control register D)103. CE register (control register E)114. CF register (control register F)13 Using the RTC-72421/RTC-72423141. Power-on procedure (initialization)142. Read/write of S1 to W registers163. Write to 30-second ADJ bit164. Using the CS1 pin17 Power supply circuit example17 Examples of connection to general-purpose microprocessor18 External dimensions19 Marking layout19 Reference data20 Application notes211. Notes on handling212. Notes on packaging21Size: 205 KBPages: 25Language: EnglishOpen manual
