您好，我在看到P89V51RD2的数据手册上面说“The clock double mode is only for doubling the internal system clock and the internal flash
memory, i.e. EA = 1. To access the external memory and the peripheral devices, careful
consideration must be taken. Also note that the crystal output (XTAL2) will not be doubled.”
我想请问，什么叫做外设时钟？
比如我设置为6CLK模式，是否意味着访问外部存储器的速度还是和12CLK模式一样的？
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