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// Map flash bank #1 into XDATA for access to "ROM mapped as data". MEMCTR = (MEMCTR & 0xF8) | 0x01;
能解释下这段意思吗？
MEMCTR是内存系统控制寄存器，这句代码就是对该寄存器赋值。具体解释如下：
对寄存器MEMCTR的BIT1和BIT2清零，并对BIT0置位。其他位保持不变
