我用的是R8C/1A片子，其中一块板子开始运行一切正常，但是突然就不对了，老TIMEER OUT，我查了一下是时钟初始化那里的问题，OCD2=0；这语句一执行就跑飞！！是什么原因啊，用内部晶振貌似可以的！！！

修改时钟需要打开保护寄存器，修改结束后请关闭保护寄存器。
time out出现的原因好象都是E8和MCU的通讯不正常。
楼主如果是在华南片区，可以直接联系我。

13530701674，我姓黄，公司丰弘科技是瑞萨的代理

请先检查硬件，比如外部时钟是否起振
程序请参考：
 unsigned char i = 0;

/*--------------------------------------------------
 - Change on-chip oscillator clock to Main clock  -
 ---------------------------------------------------*/
    prc0 = 1;                               /* Protect off                                          */
    cm13 = 1;                               /* Xin Xout                                             */
    cm15 = 1;                               /* XIN-XOUT drive capacity select bit : HIGH            */
    cm05 = 0;                               /* Xin on                                               */
    cm16 = 0;                               /* Main clock = No division mode                        */
    cm17 = 0;
    cm06 = 0;                               /* CM16 and CM17 enable                                 */ 
    while (i <= 100)                                /* This setting is an example of waiting time for the   */
        i++;                         /* oscillation stabilization. Please evaluate the time  */
                                  /* for oscillation stabilization by a user.             */
    ocd2 = 0;                               /* Main clock change                                    */
    prc0 = 0;                               /* Protect on                                           */