| ??? 07/20/06 09:23 Read: times |
#120654 - Missing Connection Responding to: ???'s previous message |
Neil Kurzman said:
8155 8052 Comment ------------------------------------------------------------ Reset A Port pin High rst, low normal ALE ALE AD0-7 P0-7 RD RD (3.7) WR WR (3.6) IO/M A Port pin High = I/O, low = RAM CE A Port pin Low = selectedhttp://www.8052.com/forum/read.phtml?id=120633 Rishab Bucha said:
the connection is:-
8155 8051 ce- p2.7,p2.6 are connected to a nand and then to ce plz note that ce is active low. wr,rd -pin 16,17 of 8051 which are wr,rd of uc. ale -ale of uc and the a/d lines of 8155 are connected in opposite manner to port 0 i.e a/d 0-p0.7 a/d 1-p0.6 and so on hence the control reg is -c000h and subsequent reg for a-c040h,b-c080h,c-c0c0h Note how much easier Neil's information is to read - simply by presenting it in a clear, tabulated format. To do this, you need to use the same 'pre' and '/pre' tags that you should use for posting code - see the instructions already provided. So, your connections are: 8155 8052 Comment ------------------------------------------------------------ ce- NAND( P2.7, P2.6 ) 8052 Address bits 15, 14 WR WR RD RD ALE -ALE AD0..7 P0.7..P0.0,Yes? As Russel said, What happened to IO/M? |
