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External Chip Select don't work !!!

chris_baragnon
Associate II
Posted on July 08, 2003 at 16:06

External Chip Select don't work !!!

2 REPLIES 2
chris_baragnon
Associate II
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
Associate II
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).