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

Hello All,

I've just about finshed cleaning up the layout for the SX48 OEM module kit.  The last bit of work is all about the silkscreen ledgends for the top/bottom of the board.  Things are getting a bit tight since i'm trying to make sure all the pins and components are labeled and trying to orient them so they do not interfere with any solder pads or vias.

A few of the part numbers will end up being hidden underneath the part after it is installed.  This shouldn't be a big deal since most are needed mainly for kit assembly and will be in the docs.  Most of the pin labels have been shortened to 2 characters like:

RB0 --> B 0
...
RE7 --> E 7

VSS --> VS
VOUT --> VO

VIN --> IN V  ( Can change to VI )

/RES -->  /R near the reset pin

There are a couple ways I can go with the remaining three pins.  At the moment they are going to the MAX232 chip and I have them labeled as:

Pin 1 - S O  (for SOUT)

Pin 2 - S IN  (for SIN)

Pin 3 - A TN  (Goes to MAX232) a 4.7K resistor can be installed on the bottom as a normal pull up on the reset line, or can be installed on the top to enable the ATN line to reset the CPU.  When the resistor is on the bottom this driver is available and Pin 3 could then be used as a RS232 serial input by adding a jumper on the module.  I want it to be flexible.

The RTCC pin from the CPU goes out to a single VIA (labeled RTC on the silkscreen) giving the builder the option of connecting it however they wish.  If you'd like to ground it simply make a solder bridge right at the CPU to the pin next to it.

The optional resonator can go in a socket underneath the module.  It is labeled Y1

And last of all is the four pin socket for the SX-KEY.  It is labeled X1 and I labeled the pin on each end.  VSS on one side and OSC1 on the other.  I wanted to make sure that was clear to prevent someone from accidently plugging it in backwards.

At the moment the only portion I am on the fence about are the labels SOUT and SIN and if I should change them to the appropriate RA pins.  I prefer to leave them as they are since it makes it obvious which way the MAX232 driver is setup and then note the pins in the docs.

I know the final result probably won't please everyone but I want to use what makes the most sense for most and go with it.....

Best Regards,

Robert

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