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怎樣做好按鍵的連鍵功能？

在按鍵掃描處理程序中，其中一個“增加鍵”要實(shí)現(xiàn)：短按就增加1，長按則2秒鐘后，每隔1/4秒連續(xù)增加，我做的要么沒有連鍵功能，要么每次按鍵都增加得太快。請問怎么解決？
實(shí)現(xiàn)例程：

  ......

main:           snz               flag_8ms
                jmp               main
                clr               flag_8ms
  ......
                call              key_scan
  ......
                jmp               main
  ......
key_scan:       ......
                MOV               a,key_num
                sub               a,251
                snz               c
                inc               key_num
                nop
                nop
                nop
                snz               pa.7
                jmp               key1_scan
                ......              
                clr               key_num
                clr               key_flag
                clr               lianma_flag
                ret

key1_scan:      MOV               a,key_num
                sub               a,3
                snz               z
                jmp               key1_scan1
                set               key_timer
                ret
key1_scan1:     sz                lianma_flag
                jmp               key1_scan2
                MOV               a,key_num
                sub               a,250
                snz               z
                ret
                set               lianma_flag
                set               key_timer
                MOV               a,3
                MOV               key_num,a
                ret
key1_scan2:     MOV               a,key_num
                sub               a,34
                snz               c
                ret
                set               key_timer
                MOV               a,3
                MOV               key_num,a
                ret
  ......
                ret