Abstract: A microprocessor controlled apparatus includes a microprocessor (2) with e.g. eight address lines (A,.sub.0,A.sub.1 . . . A.sub.7) on which signals may be applied by the microprocessor for selectively addressing a peripheral device coupled thereto, and a data device such as a LCD module (1) having data lines to which data signals may be applied for transfer into the data device. Four of the data lines (D.sub.0,D.sub.1,D.sub.2,D.sub.3) are coupled to a sub-set of the microprocessor address lines (A.sub.2,A.sub.3,A.sub.4,A.sub.5) excluding the two address lines (A.sub.0,A.sub.1) associated with the least significant bits. The signals on the sub-set of address lines are thus applied as data signals to the data device.