Searching \ for 'EE:8052 Problem' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=
Search entire site for: '8052 Problem'.

Truncated match.
PICList Thread
'EE:8052 Problem'
2010\01\22@025840 by Rich

picon face
I am troubleshooting a PCB with an 8052 uC.  The reset pulse circuit and the pulse is present on the reset pin.   I get the clock and the ALE properly.  I get data information appearing on the data lines.  I get address information after the ALE latch (74LS573); the OE is low, the ALE appears on the LE.  But the uC chip does not sign on and communicate with the RS232.  I get no signal on pin 10 of the uC (Rx) and I get no signal on pin 11 of the uC (Tx)  I am using a MAX232A which is correctly wired from the MAXIM Data sheet.  The address lines to the memory are not swapped but wired correctly. I set baud at 9600, 8 bits, 1 stop, no parity.  I tried another MAX232A even though I could propagate a signal through the drivers and got the same condition..."no sign on...no talking."  I'm Stumped.  Can anyone shed some light on this?  Are there RS232 jumpers I need to install?  The one thing I have not yet looked at is whether I am addressing the memory incorrectly.  That is next !
on my list but quite unlikely.  Any help would surely be appreciated.

More... (looser matching)
- Last day of these posts
- In 2010 , 2011 only
- Today
- New search...