用138译码器控制位选和锁存器控制段选的数码管如何消隐？？
void display(){
P0 = sma_t[i%10] ;
P2 = sba_t[7] ;
delay(2) ;
P0 = sma_t[i/10] ;
P2 = sba_t[6] ;
delay(2) ;
P0 = 0x40 ;
P2 = sba_t[5] ;
delay(2) ;
P0 = sma_t[j%10] ;
P2 = sba_t[4] ;
delay(2) ;
P0 = sma_t[j/10] ;
P2 = sba_t[3] ;
delay(2) ;
P0 = 0x40 ;
P2 = sba_t[2] ;
delay(2) ;
P0 = sma_t[k%10] ;
P2 = sba_t[1] ;
delay(2) ;
P0 = sma_t[k/10] ;
P2 = sba_t[0] ;
delay(2) ;
}
