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LPC串口驱动是c源码
/* External Interrupts */
/* 外部中断控制寄存器 */
#define EXTINT (*((volatile unsigned char *) 0xE01FC140))
#define EXTWAKE (*((volatile unsigned char *) 0xE01FC144))
#define EXTMODE (*((volatile unsigned char *) 0xE01FC148))
#define EXTPOLAR (*((volatile unsigned char *) 0xE01FC14C))