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

I agree with Jon Williams that a TTL oscillator is required to drive multiple SXs.  However, when I went looking for a TTL through hole oscillator about a year ago, I found it impossible to get one at 50 MHz.  They used to be available, but I was unable to find one at the usual sources (Mouser, DigiKey, etc).  Ultimately I ended up having to use a surface mount part.  If you're making a PCB, it's really not a big deal to solder it as it's only a 4 pin device.  If you're point to point soldering a prototype (or using a breadboard), you could simply solder some short wires to it and that would work as well.  

One thing to note - if you use a TTL style oscillator, make sure you have a jumper to disconnect the clock output between the TTL oscillator and the SX.  Do not count on using the enable pin.  Why?  Because if you disable the clock and then try and program the chip, the SX Key will not be able to generate teh programming voltage due to output diode protection on the oscillator. 

Thanks,
PeterM

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