$NOMOD51
$include (C8051F120.h)
LED BIT P1.6;
Flag BIT 00h
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 TMOD, #01h;
ret
Port_IO_Init:
mov SFRPAGE, #CONFIG_PAGE
mov P1MDOUT, #040h
mov XBR2, #040h
ret
Interrupts_Init:
mov IE, #082h;
ret
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, #06h;
    SETB Flag;
    OUT: RETI;
MAIN:
    lcall Init_Device;
    CPL LED;
    MOV R0, #06h;
    CLR FLAG;
    SETB TR0;
LOOP:
    JBC Flag, SKIP;
    SJMP LOOP;
SKIP:
    CPL LED;
    SJMP LOOP;
    END