RS5C313 RICOH Co.,Ltd., RS5C313 Datasheet - Page 20

• Manufacturer Part Number: RS5C313
• Description: Ultra-compact Real-time Clock Ic
• Manufacturer: RICOH Co.,Ltd.

20
RS5C313
After adjustment, oscillation frequency is subject to fluctuations of an ambient temperature and supply voltage.
See “10. Typical Characteristic Measurements”.
8. Interrupt Operation
The INTR pin output, the interrupt cycle register, and the CTFG bit can be used to interrupt the CPU in a certain
cycle. (The INTR pin functions as an Nch open drain output.)
8.1 Selection of Interrupt Cycle
The interrupt cycle register can be used to select either one of two interrupt output modes: the pulse mode (when
the CT
*
CT
1) The symbol “
Any rise or fall in ambient temperature from its reference value ranging from
20 to 25 degrees Celsius causes a time delay for a 32kHz crystal oscillator. It is
recommendable, therefore, to set slightly high oscillation frequency at room
temperature.
0
0
0
0
1
1
1
1
1
1
1
1
3
Interrupt cycle register
3
bit is set to 0) and the level mode (when the CT
CT
*
*
*
*
0
0
0
0
1
1
1
1
*
2
1
*
” in the above table indicates 0 or 1.
CT
0
0
1
1
0
0
1
1
0
0
1
1
1
CT
0
1
0
1
0
1
0
1
0
1
0
1
0
INTR pin output
OFF
ON
0.977ms
0.5s
1 second
10 seconds
1 minute
10 minutes
1 hour
1 day
1 week
1 month
Note
Interrupt halt
Fixing the INTR pin at the low level
Cycle: 0.977ms (1/1024Hz) Duty: 50%
Cycle: 0.5s (1/2Hz)
Every second
Every 10 seconds (For display of second digits: 00, 10, 20, 30, 40, and 50)
Every minute (00 second)
Every 10 minutes (00 second) (For display of minute digits: 00, 10, 20, 30, 40, and 50)
Every hour (00 minute and 00 second)
Every day (0 hour, 00 minute, and 00 second a.m.)
Every week (0 week, 0 hour, 00 minute, and 00 second a.m.)
Every month (1st day, 0 hour, 00 minute, and 00 second a.m.)
3
bit is set to 1).
Remarks