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RX230 Group, RX231 Group
5. LCD Display and RTC Input Capture Operation
5.1 LCD Display
The sample program displays data information on the LCD screen as described as below.
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Time information: year/month/day and hour/minute/second
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VBATT drop alert and switch push count
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RTC input capture time information: month/day and hour/minute/second
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Flash save data: year/month/day, hour/minute/second, VBATT drop alert/switch push count
RX231 Bat backup
Real time
19/05/01
00:10:30
BAT ALERT │ SW 00
Capture time
05/01
00:00:00
Previous time
19/04/30
23:59:50
BAT
5.1.1 Execution During Battery Backup Operation
1.
After VCC and VBATT are turned on, the LCD displays the time counting every second. The battery
state and the number of times SW2 has been pressed are also displayed.
Figure 5.2 Display During Normal Operation (After power-on reset)
2.
When VCC drops, the time information is saved to the data flash, and the power supply switches from
VCC to VBATT. At this point, the LCD goes blank.
3.
During battery backup operation, the RTC continue operating and the time information is updated. When
the RTCIC1 input switch (external) is turned on, the time is captured in the RTC.
4.
When VCC recovers, the power supply switches from VBATT to VCC, and the time information is again
displayed on the LCD once every second. The RTC input capture time information also is displayed.
R01AN4831EJ0100 Rev.1.00
Aug.20.19
Initial Settings and Usage Procedure of RTC Battery Backup Function
LCD screen during
normal operation
│ SW 00
Figure 5.1 Display Setting
Time information
VBATT drop alert and switch push count
RTC input capture time
Flash save data
Page 20 of 23
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