想用74154来做点阵显示，但是总是无效电平，那位帮忙看看啊！

这是程序#include<reg51.h>#define uchar unsigned char#define uint unsigned intuchar N=100; ⼀⼀每个字符显示次数uchar code TAB[4][8]={0xFD,0xFD,0xFD,0xFD,0xFD,0xFD,0xC1,0xFF, ⼀⼀L 0xE3,0xDD,0xDD,0xDD,0xDD,0xDD,0xE3,0xFF, ⼀⼀O 0xDD,0xDD,0xDD,0xDD,0xDD,0xEB,0xF7,0xFF, ⼀⼀V 0xC1,0xFD,0xFD,0xC1,0xFD,0xFD,0xC1,0xFF ⼀⼀E };sbit b=P3^0;void delay(uchar t){ while(t--) {;}}void main(void){ uchar i,j,col; b=1; while(1) { ; for(i=0;i<4;i++) { for(N=0;N<100;N++) { col=0; for(j=0;j<8;j++) { P0=TAB[i][j]; delay(100); P1=col++; } } } }}