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Epson Manuals
Control Unit
RTC-72421 A
Applications manual
Epson RTC-72421 Applications Manual
Real time clock module
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Applications manual
(25 pages)
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Contents
Table of Contents
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Table of Contents
Table of Contents
Overview
Block Diagram
Pin Connections
Pin Functions
Characteristics
Absolute Maximum Ratings
Operating Conditions
Frequency Characteristics and Current Consumption Characteristics
Electrical Characteristics (DC Characteristics)
Switching Characteristics (AC Characteristics)
When ALE Is Used
When ALE Is Fixed at
Registers
Register Table
Notes
Functions of Register Bits (Overview)
Setting the Fixed-Period Pulse Output Mode and Fixed-Period Interrupt Mode
Resetting the Fixed-Period Pulse Output Mode and Fixed-Period Interrupt Mode
Register Description
Timing Registers
S 1 to y 10 Registers
W Register
Register (PM/AM
Y 1 and y 10 Registers
Out-Of-Range Data
C D Register (Control Register
HOLD Bit
BUSY Bit
IRQ FLAG Bit
30-Second ADJ Bit
C E Register (Control Register
MASK Bit
ITRPT/STND Bit
T (D 2 ), T 1 (D 3 ) Bits
C F Register (Control Register
RESET Bit
STOP Bit
24/12 Bit
TEST Bit
Using the RTC-72421/RTC-72423
Power-On Procedure (Initialization)
Read/Write of S to W Registers
Write to 30-Second ADJ Bit
Using the CS Pin
Functions
Timing
Note
Power Supply Circuit Example
Examples of Connection to General-Purpose Microprocessor
Connection to Multiplexed Bus Type
Connection to Z80 or Compatible CPU
Connection to 68-Series MPU
Reference Data
Frequency Temperature Characteristics (Typical)
Frequency Voltage Characteristics (Typical)
Current Consumption Voltage Characteristics (Typical)
External Dimensions
Rtc-72421
Rtc-72423
Marking Layout
Treatment of Unused Input Pins
Application Notes
Notes on Handling
Static Electricity
Noise
Voltage Levels of Input Pins
Notes on Mounting
Soldering Temperature Conditions
Mounting Equipment
Ultrasonic Cleaning
Mounting Orientation
Leakage between Pins
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MQ162-01
Application Manual
Real Time Clock Module
RTC-72421/ 72423
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