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F28377D 的VREFHIA ，VREFHIB ，VREFHIC，VREFHID，是最大只能接3.3v吗？
VREFHIA ，VREFHIB ，VREFHIC，VREFHID的最大值取决于VDDA，不能超过VDDA，而VDDA通常就是3.3v。
