用单片机at89c51产生方波且可调。ADC EQU 35H CLOCK BIT P2.4 ;定义ADC0808时钟位 ST BIT P2.5 EOC BIT P2.6 OE BIT P2.7 PWM BIT P3.7 ORG 00H SJMP START ORG 0BH LJMP INT_T0 START: MOV TMOD,#02H ; MOV TH0,#20 MOV TL0,#00H MOV IE,#82H SETB TR0 WA IT: CLR ST SETB ST CLR ST ;启
! ! SYS_SIZE is the number of clicks (16 bytes) to be loaded. ! 0x3000 is 0x30000 bytes = 196kB, more than enough for current ! versions of linux ! SYS_SIZE 是要加载的节数（16 字节为1 节）。0x3000 共为 1 2 3 4 5 6 0x7c00 0x0000 0x90000 0x10000 0xA0000 system 模块 代码执
