说明.txt

来自「周立功7289键盘显示模块源代码。包括51的源驱动程序和本人编写的61驱动程序。」· 文本 代码 · 共 37 行

其他引脚可据实际情况选

INT最好用外部中断接IOB2或IOB3

外部中断的处理代码：

.PUBLIC _IRQ3
_IRQ3:
	push r1,r5 to [sp]
	r1 = C_IRQ3_EXT1
	test r1,[P_INT_Ctrl]
	jnz ?L_IRQ3_Ext1				//测试为EXT1中断则转向?L_IRQ3_Ext1
	r1 = C_IRQ3_EXT2
	test r1,[P_INT_Ctrl]
	jnz ?L_IRQ3_Ext2				//为EXT2中断则转向?L_IRQ3_Ext2
?L_IRQ3_Key:
	r1 = C_IRQ3_KEY
	[P_INT_Clear] = r1				//清中断标志位
	pop r1,r5 from [sp]
	reti
?L_IRQ3_Ext2:
	r1 = C_IRQ3_EXT2
	[P_INT_Clear] = r1              //清中断标志
	pop r1,r5 from [sp]
	reti
?L_IRQ3_Ext1:
    call _key_value_process;
	r1 = C_IRQ3_EXT1
	[P_INT_Clear] = r1              //清中断标志
	pop r1,r5 from [sp]
	reti


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