Quick and dirty
Code:
    CNT_1 VAR BYTE
    CNT VAR WORD
    HIGH PORTC.4
    PAUSE 2000
    low PORTC.4
    PAUSE 2000
START:
    FOR CNT_1 = 0 TO 24
    FOR CNT = 0 TO 600
    HIGH PORTC.4
    PAUSE 6000
    NEXT CNT
    NEXT CNT_1
    LOW PORTC.4 
    PAUSE 5000
    GOTO START