External Chip Select don't work !!!

[chris_baragnon]

Posted on July 08, 2003 at 16:06

External Chip Select don't work !!!

[chris_baragnon]

Posted on May 17, 2011 at 11:54

Hello !

I'm using the DK3200 starter kit and i want to interface a LCD Module on the A/D bus with PD2 as External Chip Select. I've selected the LCD adress at 4000 and the equation for pd2 is :

PORTD EQUATIONS :

=======================

!cs_bigLCD = !a15 & a14 & !a13 & !a12 & !a11;

cs_bigLCD.OE = 1;

In my soft i just write in xdata 4000 a such data code.

The problem is that the signal on the pd2 pin is never low !!!!

Is there somebody who know what it's like that ??

thanks

[joseph2399]

Posted on May 17, 2011 at 11:54

In the PSDsoft Express, did you setup the correct address range and qualifiers for LCD_E? Also you need to setup the correct address for ''psel '' which will allow uPSD run as ''data bus repeater'' during the given address range. Please take a look at page 4 and 5 of AN1560 and also the first design example for the DK3200 eval kit (DK3200_1).