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430的4系列MCU LCD_A控制器使用内部电阻和外部电阻在功耗和效果有什么区别，俩者具体怎么用，怎么用功耗最低。
When using an external resistor divider R33 may serve as a switched-VLCD
output when VLCDEXT = 0. This allows the power to the resistor ladder to be
turned off eliminating current consumption when the LCD is not used. When
VLCDEXT = 1, R33 serves as a VLCD input.
可以在使用手册里看到，使用外部电阻更能够减小功耗。
1.如果应用中对面积，成本等要求得多，对亮度，功耗要求不是很高，用内部电阻就合适；
2.如果要节省功耗，亮度调节更细致，则使用外部电阻，但是会增加PCB的面积和成本
