14. How to use
RX4111CE
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ETM62E-02
Seiko Epson Corporation
40
3) SWSEL1, SWSEL0 bit
When user set INIEN to 0, it is locked status of a built-in MOS switch
Table 47 INIEN, SWSEL combination
INIEN
SWSEL1
SWSEL0
SW
SPI disable
control
comment
0
0
1
OFF
OFF
Default
1
0
ON
OFF
Battery backup switchover function: OFF
0
0
OFF
OFF
Do not select this combination
1
1
OFF
OFF
Do not select this combination
1
1
1
OFF
ON
SPI-Bus interface: ON
Other than (1,1)
Auto control
ON
Battery backup switchover function: ON
When using a non-re-chargeable battery, it is necessary to install a charge protection diode externally.
Figure 30 Battery backup switchover control (Initial power on)
Voltage detection intermittent timing
Table 48 The timing of VDET1
Power supply
V
DD
(INIEN=1)
V
DD
(INIEN=0)
V
BAT
(Backup mode)
V
DET1
detection
Always ON
Stopped
Once per 31.25 ms