定时器程序 采用89c2051 SL存放秒的个位数 SH存放秒的十位数 ML存放分的个位数 MH存放分的十位数 HL存放时的个位数 HH存放时的十位数-timer procedures used 89c2051 SL storage seconds digit SH 10 seconds stored median ML kept the 000-MH median of 10 hours storage median HL stored at the single-digit HH placed at the median 10