Question

汇编语言改一下程序

ORG 0000H

START:
MOV P0, #000H
MOV P1, #255
CLR P1.1
NOP
JNB P1.0, K1
JNB P1.3, K2
JNB P1.5, K3

MOV P1, #255
CLR P1.2
NOP
JNB P1.0, K4
JNB P1.3, K5
JNB P1.5, K6

MOV P1, #255
CLR P1.4

NOP
JNB P1.0, K7
JNB P1.3, K8

; JNB P1.6, K9
SJMP START

K1: SETB P0.0
SJMP DELAY
K2: SETB P0.1
SJMP DELAY
K3: SETB P0.2
SJMP DELAY
K4: SETB P0.3
SJMP DELAY
K5: SETB P0.4
SJMP DELAY
K6: SETB P0.5
SJMP DELAY
K7: SETB P0.6
SJMP DELAY
K8: SETB P0.7

DELAY:
MOV R5, #30
DJNZ R7, $
DJNZ R6, $ - 2
DJNZ R5, $ - 4

LJMP START

END
这是个用矩阵键盘控制P0端口输出高电平的程序 我想问的是，当矩阵键盘任意键按下然后P3.0给出一个高电平接嗡鸣器用 在这个程序里加汇编语言

Answer 1

......

DELAY:

SETB P3.0

MOV R5, #30
DJNZ R7, $
DJNZ R6, $ - 2
DJNZ R5, $ - 4

CLR P3.0

LJMP START

END