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06/08/04 13:57
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 		 #72057 - Using P0 for LCD along with 64K Ext. RAM
Hello,

Most of my projects involves using internal RAM only, But for a new project; which requires huge memory storage, I have planned to use 2 x 32k NVRAMs.

The problem is if I end up using 2 ports + RD + WR for accesing RAM, I am left with very few port pins. I need them for other purpose like buzzer, relay etc...

After going through the datasheet and the previous posts, I have designed the following circuit. (This is the first time I am using External access.)



Please suggest some better method, if the above mentioned design to save port pins is poor.

If more information is required, Please let me know.

Rgds
Raj

List of 39 messages in thread
TopicAuthorDate
Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
   RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
      Ignore above, corrected version here            01/01/70 00:00      
         RE: Ignore above, corrected version here            01/01/70 00:00      
            RE: Ignore above, corrected version here            01/01/70 00:00      
               RE: Ignore above, corrected version here            01/01/70 00:00      
               RE: Ignore above, corrected version here            01/01/70 00:00      
                  RE: Ignore above, corrected version here            01/01/70 00:00      
         RE: Ignore above, corrected version here            01/01/70 00:00      
            RE: Ignore above, corrected version here            01/01/70 00:00      
               the reason for push/pop            01/01/70 00:00      
   RE: Using P0 for LCD along with 64K Ext.            01/01/70 00:00      
      RE: Using P0 for LCD along with 64K Ext.            01/01/70 00:00      
   RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
      RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
      RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
         RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
   RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
      RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
         RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
            RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
            RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
               RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
                  RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
                     RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
                     RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
   RE: Using P0 for LCD along with 64K Ext. RAM            01/01/70 00:00      
   Version 2            01/01/70 00:00      
      RE: Version 2            01/01/70 00:00      
      RE: Version 2            01/01/70 00:00      
         RE: Version 2            01/01/70 00:00      
            RE: Version 2 - Supervisory chip            01/01/70 00:00      
               RE: Version 2 - Supervisory chip            01/01/70 00:00      
      RE: Version 2            01/01/70 00:00      
      Memory maped LCD?            01/01/70 00:00      
         RE: Memory maped LCD?            01/01/70 00:00      
            RE: Memory maped LCD?            01/01/70 00:00      
               RE: Memory maped LCD?            01/01/70 00:00      
                  RE: Memory maped LCD? another way            01/01/70 00:00      

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