startup.asm

基于WINBOND单片机W78E516B的最小系统源代码.通过UART具有BOOTLOAD功能.开发环境为KEIL C51.

    NAME	?C_STARTUP

    EXTRN CODE (_MAINFUNC)

?C_C51STARTUP   SEGMENT   CODE

    CSEG    AT  0
    LJMP    STARTUP1

    CSEG    AT  6
    DW      0
    DW      0
    DB      0

    RSEG    ?C_C51STARTUP
STARTUP1:
    CLR     EA
    MOV     P0,#0FFH
    MOV     P1,#0FFH
    MOV     P2,#0FFH
    MOV     P3,#0FFH

    MOV     R0,#127
    CLR     A
IDATALOOP:
    MOV     @R0,A
    DJNZ    R0,IDATALOOP
    MOV     A,SP
    JNB     ACC.7,START10
    MOV     R7,#1
START10:
    MOV     SP,#0C0H
    LJMP    _MAINFUNC

    ISEG    AT  0C0H
    DS      40H

    END