ADXL345 with Free Fall detection

Looks like the ff function free fall is the right track.
There are two different interrupt pins on the chip a register controls which one is used
and a different register controls polarity.
Which interuppt pin is being used?

ADXL345.prototype.interrupts = function(enable,map) {
	this.i2c.writeTo(this.a,[0x2E,enable,map­]);
}

http://www.analog.com/media/en/technical­-documentation/data-sheets/ADXL345.pdf
page 27

Register 0x2F—INT_MAP (R/W)

Any bits set to 0 in this register send their respective interrupts to
the INT1 pin, whereas bits set to 1 send their respective interrupts
to the INT2 pin. All selected interrupts for a given pin are OR’ed.