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430内部RTC做万年历,误差怎么进行校准?

用5438A的内部RTC做万年历,外接32K的频率。发现时间不是很准,10分钟大约慢1S的样子。不知道什么原因,看手册说可以进行校准,一直也没搞定.现在是设置的内部电容,把外部的电容都去掉了,还是慢啊。内部的电容CAP0到CAP3都试验过了,没什么效果的。