EPSON
4BIT REAL TIME CLOCK MODULE with I/O CONNECTIONS
RTC-58321/58323
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Overview
The RTC-58321/58323 is a CMOS real time clock modules with perpetual calendar function developed for microcomputer applications.
It has a built-in 32.768 kHz quartz resonator, and provides clock and calendar registers for year, month, day, day-of-week, hours, minutes and
seconds, with 12-hour/24-hour selection, plus automatic leap-year correction with software selection for local calendars, and an additional
periodic reference signal output.
Being a CMOS device, it has a very low power consumption for battery back-up purposes.
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Features
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Adjustment-free built-in quartz resonator keeps component count low.
Built-in clock and calendar registers for year, month, day, day-of-week, hours, minutes and seconds.
12-hour/24-hour selection.
Automatic leap-year correction, with software selection for local calendars.
Counter start, stop and reset functions.
Periodic reference signal output selectable: 1024 Hz, or 1 second, 1 minute or 1 hour intervals.
Data bus is 4-bit bidirectional, with memory-type reads and writes.
CMOS device, for very low power consumption, and long battery back-up period.
Compatible at pin and function levels with the MSM58321 RS.
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Pin connections
1. CS
2
2. WRITE
3. READ
4. D
0
5. D
1
6. D
2
7. D
3
8. GND
* Connect power supply positive side to pin 16.
14 to 16. V
DD
13. CS
1
12. TEST
11. STOP
10 BUSY
9. ADDRESS WRITE
1 to 4. NC
5. CS
2
6. WRITE
7. READ
8. D
0
9. D
1
10. D
2
11. D
3
18 to 24. V
DD
17. CS
1
16. TEST
15. STOP
14. BUSY
13. ADDRESS WRITE
12. GND
NC: Pins are fixed low.
* Connect power supply positive side to pin 24.
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