RS5C313 RICOH Co.,Ltd., RS5C313 Datasheet - Page 26

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

26
RS5C313
11.4 Second-digit Adjustment by ±30 seconds
11.5 Oscillation Start Judgment
11.6 Interrupt Operation
(a) Cyclic Interrupt Operation (Every 1 Second to 1 Month)
YES
Control register ←3h, 7h
Set interrupt cycle register
Cyclic interrupt operation
Control register ←2h, 6h
Oscillation start
Control register ←2h, 6h
Interrupt to CPU
CTFG=1?
Power-on
XSTP=0?
YES
NO
*
*
6
1
*
*
*
2
4
NO
5
Interrupt operation
from any other IC
operations
Wait or
other
*
3
*
*
*
*
*
*
1) Write 3h for the 12-hour format or 7h for the 24-hour format and then set the
2) The XSTP bit is set to 1 upon power-on from 0V.
3) It takes approximately 0.1 to 2 seconds to start oscillation.
4) Write 2h for the 12-hour format or 6h for the 24-hour format.
5) Set the interrupt cycle register to the level mode by setting the CT3 bit to 1.
6) Write 2h for the 12-hour format or 6h for the 24-hour format.
Ensure stable oscillation by preventing the following:
1) Condensation on the crystal oscillator
2) Instantaneous disconnection of power
3) Generation of clock noises, etc. in the crystal oscillator
4) Charge of voltage exceeding prescribed maximum ratings
ADJ bit to 1. (The BSY bit is held at 1 for a maximum duration of 122.1µs
after the ADJ bit is set to 1.)
Provide an exit from an oscillation start loop to prepare for oscillation failure.
to the individual pins of the IC
When using the XSTP bit