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

To put the SX to sleep itself, all you need to do is use the "SLEEP" command.  I've seen others put a few "nop" commands directly after, though I don't know the exact reasoning.  To wake it up, you just need to configure a few registers:

[CODE]
WKED_B = %1111_1110
WKPND_B = 0           	
WKEN_B = %1111_1110    	
[/CODE]

WKED_B specifies which edge triggers the wake up routine.  1's signify a falling edge and 0's signify a rising edge.  In this example, RB.0 is set to look for a rising edge before waking up the SX.  The WKPND_B register should be cleared before every time you put the SX to sleep.  The WKEN_B register is what specifically enables the port B pins to wake up the chip when triggered.  0's enable the pins.  Only RB.0 is enabled here.

The 2N2222 transistor should work just fine for your needs, though something like a TIP110 might be more straightforward to implement.

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