在MSP430G2系列手册看到上拉电阻和下拉电阻的阻值，最小是20KΩ，最大是50KΩ，典型值是35KΩ。
那么这个值是在一个单片机上固定的还是在同一个单片机的不同引脚可能相差很大。有没有高人研究过这个问题？
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