I am trying to learn 8051 programming.I wrote a code that sends upside down question mark to the LCD.the LCd displays it .but filfills up all the places with same character can any one tell me why this may be happenning.Please tell me if this way of writing to cgram and ddram area is correct.Command is the rutine for setting RS,R/w and E line to write to IR and data is the routine to write to data register.

mov a,#40h ; setting to write in cg ram area
acall command
mov a,#04h ;sending first row bits
acall data
mov a,#00h ; sending second row
acall data

mov a,#04h
acall data
mov a,#08h
acall data

mov a,#10h
acall data
mov a,#11h
acall data

mov a,#0eh
acall data
mov a,#00h ;sending eighth row as 0 since it is cursor place
acall data

mov a,#80h ; entering DDRAM area
acall command