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AM3874 RTC 断电时间保存问题

Other Parts Discussed in Thread: AM3874


在linux下的rcS里加入hwclock -s,期望能在断电后,通过电池保存的RTC时间,在下次启动时将RTC时间同步到系统时间中去。但是测试结果证明RTC时间并没有保存。硬件电池供电RTC电路是在TPS659113A2ZRC芯片的VBACKUP信号处接了个电池到GND。

1、请问是什么原因导致?

2、AM3874 CPU管脚上为什么没有呢?