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8 JUMPER SWITCH SETTINGS
S5U1C17801T1100 HARDWARE MANUAL
EPSON
23
(SOFTWARE EVALUATION TOOL FOR S1C17801)
Setting for JP2
JP2 can be used to select the power supply source for RTCVDD as shown in the following. Short 2-3 on JP2 to se-
lect V
DD for the power supply to RTCVDD, whereas 1-3 to select battery. For details, see the description of RTC
control circuit in Chapter 10. Note that, when 1-2 is shorted, a coin cell battery is required to activate RTCV
DD.
Factory default setting for JP2 is 1-2 shorted.
JP2
JP2
C55
0.1µF
C47
10µF
JP2
DIC-149-3P
1
2
12
3
To
RTCVDD
V
DD
D10
CRS06
BAT1
106
VDD
Battery
+
–
Fig. 8.2.1 JP2 Related Circuit