Disable the on-chip brown out detect function.
Some PICAXE chips have a programmable internal brown out detect function, to automatically cleanly reset the chip on a power brown out (a sudden voltage drop on the power rail below the minimum operating voltage). The brown out detect is always enabled by default when a program runs.
However it is sometimes beneficial to disable this function to reduce current drain in battery powered applications whilst the chip is 'sleeping'. Use of the disablebod command prior to a sleep will considerably reduce the current drawn during the actual sleep command. However you must still ensure that the operating voltage does not drop below the minimum operating voltage or else unreliable behaviour may occur.
The brownout voltage is fixed for each device as follows:
||20X2, 14M2, 18M2, 20M2, 28X2, 40X2
||08, 08M, 14M, 20M, 28X1, 40X1
||18, 18A, 18M, 18X, 28A, 28X, 40X
The brown out detection can be re-enabled by a reset, or via the enablebod command.