在G0的参考手册里有详细的如下描述：：
Two voltage ranges are available:
Range 1: High-performance range
The main regulator provides a typical output voltage at 1.2V. The system clock
frequency can be up to 64MHz. The Flash access time for read access is minimum, write and erase operations are possible.
Range 2: Low-power range
The main regulator provides a typical output voltage at 1.0V. The system clock
frequency can be up to 16 MHz.The Flash memory access time for a read access is
increased as compared to Range 1; write and erase operations are not possible.
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Two voltage ranges are available:
Range 1: High-performance range
The main regulator provides a typical output voltage at 1.2V. The system clock
frequency can be up to 64MHz. The Flash access time for read access is minimum, write and erase operations are possible.
Range 2: Low-power range
The main regulator provides a typical output voltage at 1.0V. The system clock
frequency can be up to 16 MHz.The Flash memory access time for a read access is
increased as compared to Range 1; write and erase operations are not possible.