QG8小demo板上，初始化代码是由DI自动生成，但是在一执行MCU_Init这后，就提示： Target speed change detected new speed 12.49MHz 我知道是改变了BDM的连接速率，按理应不会啊？另外，BDM不是有后备时钟吗？ 不知QG8中有没有？查询数据手册，没找到相关说明。初用9s08系列特别麻烦，一遇到解决不了的问题，就要查阅大量的相关资料，可是资料又少。可以说我们就像一个拓荒者。随便哆嗦两句，以下是MCU_Init代码，请各位指点下：
/* ### MC9S08QG8_16 "Cpu" init code ... */
/* PE initialization code after reset */
/* Common initialization of the write once registers */
/* SOPT1: COPE=1,COPT=1,STOPE=0,BKGDPE=1,RSTPE=0 */
SOPT1 = 0xD2;
/* SPMSC1: LVDF=0,LVDACK=0,LVDIE=0,LVDRE=1,LVDSE=1,LVDE=0,BGBE=0 */
SPMSC1 = 0x18;
/* SPMSC2: PDF=0,PPDF=0,PPDACK=0,PDC=0,PPDC=0 */
SPMSC2 = 0x00;
/* SPMSC3: LVDV=0,LVWV=0 */
SPMSC3 &= (unsigned char)~0x30;
/* System clock initialization */
ICSTRM = *(unsigned char*far)0xFFAF; /* Initialize ICSTRM register from a non volatile memory */
ICSSC = *(unsigned char*far)0xFFAE; /* Initialize ICSSC register from a non volatile memory */
/* ICSC1: CLKS=0,RDIV=0,IREFS=1,IRCLKEN=0,IREFSTEN=0 */
ICSC1 = 0x04; /* Initialization of the ICS control register 1 */
/* ICSC2: BDIV=1,RANGE=0,HGO=0,LP=0,EREFS=0,ERCLKEN=0,EREFSTEN=0 */
ICSC2 = 0x40; /* Initialization of the ICS control register 2 */
/* SOPT2: COPCLKS=0,IICPS=1,ACIC=0 */
SOPT2 = 0x02;
/* Common initialization of the CPU registers */
/* PTADD: PTADD5=0 */
PTADD &= (unsigned char)~0x20;
/* PTAPE: PTAPE5=1 */
PTAPE |= (unsigned char)0x20;
/* PTASE: PTASE4=1,PTASE3=1,PTASE2=1,PTASE1=1,PTASE0=1 */
PTASE |= (unsigned char)0x1F;
/* PTBSE: PTBSE7=1,PTBSE6=1,PTBSE5=1,PTBSE4=1,PTBSE3=1,PTBSE2=1,PTBSE1=1,PTBSE0=1 */
PTBSE = 0xFF;
/* PTADS: PTADS5=0,PTADS4=0,PTADS3=0,PTADS2=0,PTADS1=0,PTADS0=0 */
PTADS = 0x00;
/* PTBDS: PTBDS7=0,PTBDS6=0,PTBDS5=0,PTBDS4=0,PTBDS3=0,PTBDS2=0,PTBDS1=0,PTBDS0=0 */
PTBDS = 0x00;
/* ### Init_IIC init code */
/* IICF: MULT1=0,MULT0=1,ICR5=0,ICR4=0,ICR3=0,ICR2=0,ICR1=0,ICR0=0 */
IICF = 0x40;
/* IICA: ADDR7=0,ADDR6=0,ADDR5=0,ADDR4=0,ADDR3=0,ADDR2=0,ADDR1=0 */
IICA = 0x00;
/* IICS: TCF=0,IAAS=0,BUSY=0,ARBL=1,SRW=0,IICIF=1,RXAK=0 */
IICS = 0x12; /* Clear the interrupt flags */
/* IICC: IICEN=1 */
IICC |= (unsigned char)0x80;
/* IICC: IICEN=1,IICIE=0,MST=0,TX=1,TXAK=0,RSTA=0 */
IICC = 0x90;
/* ### Init_COP init code */
SRS = 0xFF; /* Clear WatchDog counter */
/* ### Init_IRQ init code */
/* ** Initialize pin PTA5_IRQ_TCLK_RESET ** */
/* IRQSC: IRQIE=0 */
IRQSC &= (unsigned char)~0x02; /* Disable IRQ Interrupt */
/* IRQSC: IRQACK=1 */
IRQSC |= (unsigned char)0x04;
/* ### Init_GPIO init code */
/* PTADD: PTADD3=0,PTADD2=0 */
PTADD &= (unsigned char)~0x0C;
/* ### Init_MTIM init code */
/* MTIMMOD: MOD=0 */
MTIMMOD = 0x00;
/* MTIMCLK: CLKS=0,PS=0 */
MTIMCLK = 0x00;
/* MTIMSC: TOF=0,TOIE=0,TRST=0,TSTP=1 */
MTIMSC = 0x10;
/* ### Init_GPIO init code */
/* PTBDD: PTBDD5=0 */
PTBDD &= (unsigned char)~0x20;
/* ### */
asm CLI; |
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