'[HD44780] Controller received data whist busy' error while simulating

I am getting '[HD44780] Controller received data whist busy' error while simulating in proteus. Is there any delay I should consider, if then when and how much? Thanks

code:

Code:

---

       
Gosub clear lcd

main:
' other calculations
LCDOUT $FE,$80,"P>",DEC P1,".",DEC P2,DEC P3,"  ","CURRENT"
LCDOUT $FE,$C0,"I>",DEC I1,".",DEC I2,DEC I3,"  ","TEM>",DEC S1,DEC S2,".",DEC S3
LCDOUT $FE,$90,"D>",DEC D1,".",DEC D2,DEC D3 ;," ", DEC DEL
LCDOUT $FE,$D0,"SET TEMP>",DEC T1,DEC T2,".",DEC T3

---

goto main

clear_lcd:
LCDOUT $FE,$01,$02
return

Well the most obvious thing is your calling a sub that doesn't exist.

Second would be better if you showed all your code as it's not obvious where the snippet shown fits.

Just sayin'.

According to the data sheet most instructions take 3 cycles except "Clear display" which takes 165. Suggest you explicitly declare the defines related to LCD operation and specifically LCD_COMMANDUS and LCD_DATAUS. Play with these values till Proteus is happy or turn off the warning if it works in your real world config.

George