RS5C348A RICOH Co.,Ltd., RS5C348A Datasheet - Page 44

• Manufacturer Part Number: RS5C348A
• Description: 4-wire Serial Interface Real-time Clock
• Manufacturer: RICOH Co.,Ltd.

Rx5C348A/B
Rev.2.01
(3) Applied Process of Reading Time and Calendar Data with Periodic Interrupt Function
Time data need not be read from all the time counters when used for such ordinary purposes as time count
indication. This applied process can be used to read time and calendar data with substantial reductions in the
load involved in such reading.
For Time Indication in "Day-of-Month, Day-of-week, Hour, Minute, and Second" Format:
Generate interrupt to CPU
12345
Control Register 1←
Control Register 2←
Control Register 2←
Read Min.,Hr.,Day,
and Day-of-week
(XXXX0100)
(X1X1X011)
(X1X1X011)
CTFG=1?
Sec.=00?
Yes
Yes
*2)
*4)
*1)
No
Day, and Day-of-week data
No
Use previous Min.,Hr.,
*3)
Other interrupts
Processes
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*1) This step is intended to select the level
*2) This step must be completed within 1.0
*3) This step is intended to read time data
*4) This step is intended to set the CTFG
mode as a waveform mode for the
periodic interrupt function.
sec.
from all the time counters only in the
first session of reading time data after
writing time data.
bit to 0 in the Control Register 2 to
cancel an interrupt to the CPU.