In SX Microcontrollers, SX/B Compiler and SX-Key Tool, johncouture wrote:

Jon,

In the last couple of classes we have been having trouble with some PDB's and getting the SX to recognize keyboard input.  Our setup is as follows:

Using your program unmodified and the Prof Dev Board we connect:

RA.0 to the TX pin of the RS-232 DCE (PDB schematic, pg 6 connextor X13, #2)

RA.1 to connector X13, #4

RA.2 to SDA (and a 4.7K resistor from there to +5V)

RA.3 to SCL (and a 4.7K resistor from there to +5V) 

took the plastic tab out of the battery on the DS1307.

USB for programming, another USB->Serial to connect to the DB9 on the PDB (near the X13 connector)

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

What Happens:

Load your program (4mhz).

Start up HyperTerminal, set to 38400, 8n1,   Flow Control None.

Prompt comes up and it displays the "Menu" and then ">>" 

But then it does not respond to any keypress.  We tried "s" and "S".

Now sometimes it works if you just hold the key down.

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QUESTION:

Do we need to trigger CTS or RTS in order to get that crazy thing to work smoothly?  

Is Hyperterminal not the most ideal program to use for this application?

When the MCU is off trying to read the clock it seems that a keypress would also not work.  As always, it is something simple that I am missing.

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