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

Expansion of the SX48 to a SX52, isn't difficult, simply use a transparent D type latch, use the existing porta as control for the latch (uses a single pin if you don't tristate the latch), and latch one of the other ports. In the end you gain 3 I/O, if you use a surface mount package, you consume little PCB space especially if you can use a BGA type, something which is offet by the smaller SX48. The software adds only a couple lines when acessing the external port. This suggestion is for an output port, similar and equally valid solutions exist for input ports. Yes this takes away the ability for the port to operate as both input and output, but only an extremely small percentage of applications require so many bi-directional pins (Id venture your more likely to be struck by lightning when in a mile deep mining shaft, than need a solution with 40 bi-directional pins). All in all the redesign is simple and straightforward, and if your in this industry your either green or nieve to think ocassion redesigns aren't nessesary.

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