h11.asm

(1)完成键盘

LED    equ P1.0
LEDBuf equ 0

       ljmp    Start

       org     3
Interrupt0:
       push    PSW         ; 保护现场
       cpl     LEDBuf      ; 取反LED
       mov     c, LEDBuf
       mov     LED, c
       pop     PSW         ; 恢复现场

       reti

Start:
       clr     LEDBuf
       clr     LED
       mov     TCON, #01h  ; 外部中断0下降沿触发
       mov     IE, #81h    ; 打开外部中断允许位(EX0)及总中断允许位(EA)
       ljmp    $

       end