Renesas RX230 Series Manual page 5

RX230 Group, RX231 Group
VCC/VBATT
State
(1) (initial state)
Vcc = On (active)
Vbatt = On
(2) Vcc = On Off,
Vbatt = On  On
(switch to battery)
(3) Vcc = Off,
Vbatt = On
(battery active)
Vcc = Off  On,
(4)
(switch to VCC)
Vbatt = On
(5) Vcc = On
(VCC active)
Vbatt = On
(6) Vcc = On
Vbatt = On  Off
(battery depleted)
R01AN4831EJ0100 Rev.1.00
Aug.20.19
Initial Settings and Usage Procedure of RTC Battery Backup Function
Table 1.1 Operating Conditions
VBATT Pin
Voltage Voltage Drop
Monitor 0 Detection
Reset Interrupt
(Vdet0) (Vdetvbt)
No Enable
generated
Generated No
On hold No
Released No
Not Enable
generated
Not Generated
generated
RTC Data Saved
LCD
Count (RAM, Time
Operation Display Information)
Operating Yes No
Operating Turn off Saved
Operating No Saved
(No if
VBATT
below
1.8V)
Operating Turn on Saved
Operating Yes Saved
Operating Yes Saved
RTC
Initialization Input Capture
Yes Enable
No Enable
No Enable
(inputted)
No Enable
(Yes if VBATT
below 1.8V
detected)
No Enable
No Enable
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