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RTC-72421
Epson RTC-72421 User Manual
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RTC-72421/72423
■
Using the RTC-72421/RTC-72423
1.
Power-on procedure (initialization)
When power is turned on, the contents of all registers and the output from the STD.P pin are undefined. Therefore, all
the registers must be initialized after power on. Follow the procedure given below for initialization.
19
21
Table of Contents
Table of Contents
3
Overview
5
Block Diagram
6
Pin Connections
6
Pin Functions
7
Characteristics
8
Absolute Maximum Ratings
8
Operating Conditions
8
Frequency Characteristics and Current Consumption Characteristics
8
Electrical Characteristics (DC Characteristics)
9
Switching Characteristics (AC Characteristics)
10
When ALE Is Used
10
When ALE Is Fixed at
12
Registers
13
Register Table
13
Notes
13
Functions of Register Bits (Overview)
14
Setting the Fixed-Period Pulse Output Mode and Fixed-Period Interrupt Mode
14
Resetting the Fixed-Period Pulse Output Mode and Fixed-Period Interrupt Mode
14
Register Description
15
Timing Registers
15
S 1 to y 10 Registers
15
W Register
15
Register (PM/AM
15
Y 1 and y 10 Registers
15
Out-Of-Range Data
15
C D Register (Control Register
16
HOLD Bit
16
BUSY Bit
16
IRQ FLAG Bit
16
30-Second ADJ Bit
17
C E Register (Control Register
17
MASK Bit
17
ITRPT/STND Bit
18
T (D 2 ), T 1 (D 3 ) Bits
18
C F Register (Control Register
19
RESET Bit
19
STOP Bit
19
24/12 Bit
19
TEST Bit
19
Using the RTC-72421/RTC-72423
20
Power-On Procedure (Initialization)
20
Read/Write of S to W Registers
22
Write to 30-Second ADJ Bit
22
Using the CS Pin
23
Functions
23
Timing
23
Note
23
Power Supply Circuit Example
23
Examples of Connection to General-Purpose Microprocessor
24
Connection to Multiplexed Bus Type
24
Connection to Z80 or Compatible CPU
24
Connection to 68-Series MPU
24
Reference Data
25
Frequency Temperature Characteristics (Typical)
25
Frequency Voltage Characteristics (Typical)
25
Current Consumption Voltage Characteristics (Typical)
25
External Dimensions
26
Rtc-72421
26
Rtc-72423
26
Marking Layout
26
Treatment of Unused Input Pins
26
Application Notes
27
Notes on Handling
27
Static Electricity
27
Noise
27
Voltage Levels of Input Pins
27
Notes on Mounting
28
Soldering Temperature Conditions
28
Mounting Equipment
28
Ultrasonic Cleaning
28
Mounting Orientation
28
Leakage between Pins
28
4
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Epson RTC-72421 Specifications
General
Brand
Epson
Model
RTC-72421
Category
Control Unit
Language
English
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