$NOMOD51
$include (C8051F120.h)
LED BIT P1.6;
CSEG AT 0;
LJMP MAIN;
ORG 000Bh;
AJMP T0_ISR
; Peripheral specific initialization functions,
; Called from the Init_Device label
Reset_Sources_Init:
    mov  WDTCN,     #0DEh
    mov  WDTCN,     #0ADh
    ret
Timer_Init:
    mov  SFRPAGE,   #TIMER01_PAGE
    mov  TL0,       #0h
    mov  SFRPAGE,   #TIMER01_PAGE
    mov  TH0,       #0h
    mov  SFRPAGE,   #TIMER01_PAGE
    mov  TCON,      #010h
    mov  SFRPAGE,   #TIMER01_PAGE
    mov  TMOD,      #001h
    ret
Port_IO_Init:
    mov  SFRPAGE,   #CONFIG_PAGE
    mov  P1MDOUT,   #040h
    mov  XBR2,      #040h
    ret
Interrupts_Init:
    mov  IE,        #082h
    ret

; Initialization function for device,
; Call Init_Device from your main program
Init_Device:
    lcall Reset_Sources_Init
    lcall Port_IO_Init
    lcall Timer_Init
    lcall Interrupts_Init
    ret
T0_ISR:
    CLR TF0;
    DJNZ R0, OUT;
    MOV R0, #05h;
    CPL LED;
OUT:
    RETI;
MAIN:
    lcall Init_Device;
    CLR LED;
    MOV R0, #05h;
    SETB TR0;
    JMP $;
end