rs5c338a RICOH Co.,Ltd., rs5c338a Datasheet - Page 46

• Manufacturer Part Number: rs5c338a
• Description: 3-wire Serial Interface Real-time Clock Ics With Voltage Monitoring Function
• Manufacturer: RICOH Co.,Ltd.

46
R
8.4 Interrupt Process
8.4-1 Periodic Interrupt
8.4-2 Alarm Interrupt
×
5C338A
Generate Interrupt to CPU
Set Alarm Minute, Hour,
and Day-of-week Registers
Generate Interrupt to CPU
Periodic Interrupt Process
Set Periodic Interrupt
Cycle Selection Bits
Conduct Alarm Interrupt
Write “×,1,×,1,×,1,0,1”
to Control Register 2
Write “×,1,×,1,×,0,1,1”
to Control Register 2
WALE or DALE=0
WALE or DALE=1
WAFG or DAFG=1?
CTFG=1?
YES
YES
*
*
*
*
*
NO
2
1
2
1
NO
3
Other Interrupt
Processes
Other Interrupt
Processes
*
*
*
*
*
1) This step is intended to select the level mode as a waveform mode for the
2) This step is intended to set the CTFG bit to 0 in the control register 2 to
1) This step is intended to once disable the alarm interrupt circuit by setting
2) This step is intended to enable the alarm interrupt function after completion
3) This step is intended to once cancel the alarm interrupt function by writing
periodic interrupt function.
cancel an interrupt to the CPU.
the WALE and DALE bits to 0 in anticipation of the coincidental occurrence
of a match between current time and preset alarm time in the process of
setting the alarm interrupt function.
of all alarm interrupt settings.
the settings of “×,1,×,1,×,1,0,1” and “×,1,×,1,×,1,1,0” to the Alarm_W
registers and the Alarm_D registers, respectively.