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

Oh yeah Ken I missed that, that is caused by the trace starting in the center of the pad and since he takes traces inward and outward which are wider than the traces that effect is produced.
 

Here is a couple excepts of my last board using an SX52, I don't claim its a perfect layout but I did spend considerable effort researching and thinking about the layout. The first is a photo without flood fills shown, its easier to pick out the components. #1 is the SX, #2 is the oscillator, I placed this further away because it is an actively driven oscillator which can be placed further from the processor, you are using a resonator which relies upon the SX to drive it so it must be placed closer. #3 is an SPDT switch to switch between the oscillator and the SX-Key header, an actively driven oscillator and the SX-Key must not drive the OSC line simultaneously because the oscillator will damage the SX-Key. #4 is the SX-Key header to program the SX. #5 is the reset button and #6 is one of the 4 bypass capacitors of the SX to reduce ripple in the power supply.

 

The second picture shows the flood filled areas, the blue is the backside ground plane, and the red underneath the SX is a Vdd flood fill on the top side of the board.

 

Perhaps these examples can help illustrate some of the points I was making.

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