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CONTENTS
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Overview.............................................................................................................................................. 1
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Features............................................................................................................................................... 1
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Pin connections .................................................................................................................................. 1
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Block diagram ..................................................................................................................................... 1
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Pin functions ....................................................................................................................................... 1
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Characteristics .................................................................................................................................... 1
1. Absolute maximum ratings ........................................................................................................................ 1
2. Operating Conditions................................................................................................................................. 1
3. Frequency characteristics .......................................................................................................................... 1
4. DC characteristics ..................................................................................................................................... 1
5. AC characteristics ..................................................................................................................................... 1
6. Timing chart .............................................................................................................................................. 1
7. Data hold timing ........................................................................................................................................ 1
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Registers.............................................................................................................................................. 1
1. Register table ............................................................................................................................................ 1
2. Notes ........................................................................................................................................................ 1
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Register functions............................................................................................................................... 1
1. Date and time registers.............................................................................................................................. 1
2. Reset register (Control register D).............................................................................................................. 1
3. Reference signal (Control registers E and F) .............................................................................................. 1
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Package dimensions........................................................................................................................... 1
(1)RTC-58321 ............................................................................................................................................... 7
(2)RTC-58323 ............................................................................................................................................... 7
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Marking layout..................................................................................................................................... 1
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Application notes ................................................................................................................................ 1
EPSON
Page - 1
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.
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Built-in clock and calendar registers for year, month, day, day-of-week, hours, minutes and seconds.
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12-hour/24-hour selection.
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Automatic leap-year correction, with software selection for local calendars.
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Counter start, stop and reset functions.
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Periodic reference signal output selectable: 1024 Hz, or 1 second, 1 minute or 1 hour intervals.
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Data bus is 4-bit bidirectional, with memory-type reads and writes.
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CMOS device, for very low power consumption, and long battery back-up period.
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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
14 to 16. V
DD
13. CS
1
12. TEST
11. STOP
10 BUSY
9. ADDRESS WRITE
* Connect power supply positive side to pin 16.
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.
RTC-58321/58323
Page - 2
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Block diagram
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Pin functions
Pin numbers
Pin symbol
Input/output
Function
RTC-58321
RTC-58323
1
5
CS
2
Input
Chip select. When high, device can be accessed.
2
6
WRITE
Input
Set high to write.
3
7
READ
Input
Set high to read.
4 to 7
8 to 11
D
0
to D
3
Both
Address/data bus.
8
12
GND
Negative power supply.
9
13
ADDRESS
WRITE
Input
Address latch. Set high to latch address from D
0
to D
3
.
10
14
BUSY
Output
1 Hz output pin.
11
15
STOP
Input
1 Hz on/off control pin. When high, the 1 Hz signal is disabled, and
the counter stopped.
12
16
TEST
Input
Increment pin for the counter. Normally this pin should be fixed low.
13
17
CS
1
Input
Connect to power down detection circuit. (Fix high if there is no
power down detection circuit.) When CS
1
is low, chip cannot be
accessed, regardless of state of CS
2
.
*
1 to 4
NC
Fix low.
14 to 16
18 to 24
V
DD
Positive power supply (normally +5 V).
* A bypass capacitor (minimum 0.01
F) must be connected between V
DD
and V
SS
, as close as possible.
Y10
Y1
Day-of week
1/7
1/10|1/10
Year
1/12
Month
1/10|1/3
Day
or
1/12|1/24
Hours
1/10|1/6
Minutes
1/10|1/6
Seconds
TEST
DATA BUS
ADDRESS
WRITE
D
2
D
3
D
1
D
0
CS2
CS1
READ
WRITE
TEST
STOP
1
A
1'
A
BUSY
OSC
32.768 kHz
quarts oscillator
1Hz
1024Hz
BUSY
R
1/2
15
R
MO10
MO1
D10
D1
W
H10
H1
M110
M11
S10
R
1'
R
1'
R
1'
R
1'
R
1'
R
1'
R
1'
N
D
S1
S1
S10
M11
M110
H1
H10
W
D1
D10
M01
M010
Y1
Y10
D
E-F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E-F
D
10'
D
11'
D
12'
D
13'
u
Rp = 200K
TYP
TRI-STATE
CONTROL
ADDRESS
LATCH
E, F
SWITCH
1024H
z
1/3600Hz
1/60Hz
1Hz
2
A
3
A
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