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General| Brand | Epson |
|---|---|
| Model | RTC-72421 |
| Category | Control Unit |
| Language | English |
Defines voltage, current, and temperature limits for device operation.
Specifies supply voltage, operating temperature, and data hold voltage.
Details frequency tolerance, temperature/voltage effects, and current draw.
Specifies timing parameters for data transfer when the Address Latch Enable (ALE) pin is active.
Specifies timing parameters when the ALE pin is held at VDD, covering write and read modes.
Lists all registers, their addresses, bits, and functions.
Describes 4-bit BCD registers for year, month, day, hour, minute, and second digits.
A counter register (0-6) for day digits, can be used for day of the week.
Contains 10-hour digit and PM/AM bit; depends on 12/24 hour mode.
Handles the last two digits of the year, including leap year identification.
Warns about potential errors and unpredictable behavior with impossible date/time settings.
Controls access to S1-W registers, affecting the BUSY bit status.
Indicates if digits are being incremented, enabling/disabling access to S1-W registers.
Status bit linked to STD.P pin output, indicating interrupt requests.
Performs a 30-second correction, rounding to the nearest minute.
Controls the STD.P pin output for pulse or interrupt modes.
Selects between fixed-period pulse output and fixed-period interrupt mode.
Select the timing for fixed-period pulse output or interrupt generation.
Clears sub-second counter bits. Reset is active while the bit is 1.
Stops clock operation from the 1/8192 second bit onward.
Switches between 12-hour and 24-hour clock modes; affects PM/AM validity.
Reserved for EPSON testing; operation not guaranteed if set to 1.
Outlines steps to initialize registers and outputs after power-on.
Explains CS1 pin roles in operation, standby mode, and data protection.
Illustrates timing diagrams for shifting to/from standby mode.
Warns about potential data overwrites if timing conditions are not followed.
Shows wiring diagrams for connecting to 8085/MCS48,51 microprocessors.
Illustrates connection diagrams for Z80 and SMC84C00AC CPUs.
Provides wiring examples for 68-series microprocessors.
Explains frequency-temperature characteristics and overall clock accuracy calculation.
Graph showing frequency deviation versus supply voltage.
Graph showing current consumption versus supply voltage.
Provides detailed physical dimensions for the RTC-72421 package.
Provides detailed physical dimensions for the RTC-72423 package.
Provides guidelines for handling the RTC module, focusing on static electricity and noise.
Specifies safe soldering temperatures and methods for RTC-72421 and RTC-72423.
Advises on confirming module survivability with mounting equipment.
Warns about potential damage from ultrasonic cleaning due to resonance.
Emphasizes confirming correct mounting orientation to prevent damage.
Advises ensuring the device is dry and clean before powering to prevent leakage.
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