键盘接口设计 作业一 如何利用最少的按键，完成闹钟的当前时间与响铃时间的设置。

A.wire hour_equ,min_equ; wire time_equ; _8bitcomparator u3(hour_equ,set_hour_value, Hour ); _8bitcomparator u4(min_equ ,set_min_value , Minute); assign time_equ=(hour_equ &&　min_equ);#B.wire hour_equ,min_equ; wire time_equ; _8bitcomparator u3(Hour,set_hour_value, hour_equ ); _8bitcomparator u4(Minute ,set_min_value ,min_equ ); assign time_equ=(hour_equ &&　min_equ);#C.wire hour_equ,min_equ; wire time_equ; _8bitcompa

A.4

B.5

C.6

D.8

A.4

B.5

C.6

D.8

A.当没有按键按下时,读到的键值一定是全1;

B.非编码键盘的键扫描程序中,一定会有延时去抖动的程序代码;

C.键盘扫描程序中,一定会有的等待键释放的代码;

D.键盘扫描周期一定要小于按键按下所能维持的时间;