一个关于I/O口的问题

只看该作者 · 2009-1-6 09:29

我的IO初始化是不是有点问题,PA口输出电平不对,是不是我忽略了什么
if ( 1 ) {
      ADCSC1 = 0x00;

      /*A¿Ú³õÊ¼»¯*/
      PTADD = (unsigned char)0xFF;
      PTAPE = (unsigned char)0x00;//½ûÖ¹A¿ÚÉÏÀ
      PTASE = (unsigned char)0x00;//²»ÏÞÖÆA¿Ú°ÚÂÊ
      PTADS = (unsigned char)0x0F;
      PTASC = (unsigned char)0x00;
      PTAPS = (unsigned char)0x00;
      PTAES = (unsigned char)0x00;
      PTAD  = (unsigned char)0xFF;

      /*B¿Ú³õÊ¼»¯*/
      PTBDD = (unsigned char)0x06;
      PTBPE = (unsigned char)0x00;//½ûÖ¹B¿ÚÉÏÀ
      PTBSE = (unsigned char)0x00;//²»ÏÞÖÆB¿Ú°ÚÂÊ
      PTBDS = (unsigned char)0x00;
      PTBSC = (unsigned char)0x00;
      PTBPS = (unsigned char)0x00;
      PTBES = (unsigned char)0x00;
      PTBD  = (unsigned char)0x00;
      /*C¿Ú³õÊ¼»¯*/
      PTCDD = (unsigned char)0xFB;//·½Ïò¿Ú¿ØÖÆ
      PTCPE = (unsigned char)0x00;//½ûÖ¹ÉÏÀ
      PTCSE = (unsigned char)0x00;//²»ÏÞÖÆ°ÚÂÊ
      PTCDS = (unsigned char)0x08;//½ûÖ¹Ç¿Çý¶¯
      PTCD  = (unsigned char)0x00;
      //GNGC = £¨unsigned char)0x00;?      PTCD  = (unsigned char)0x00;
      ADCSC1 = 0x00;
    }
     else{

     }
是不是还有什么寄存器需要设置一下,变成普通的IO使用

只看该作者 · 2009-1-6 09:33

在SH4 MCU里面 Ganged Output是用来干什么呢

只看该作者 · 2009-1-6 11:31

PTA4/5和RESET/BKGD复用，必须设SOPT1将其置为IO

ganged output是多路IO并联输出，以增强外部负载的驱动能力。一旦相关引脚被设为“ganged output”，所有相关控制将自动和PTC0保持一致，亦即PTC0代表了其它所有“ganged output”引脚的功能：这也许是学习了我D精髓**后的结果？？？