An overfill prevention valve for mounting on the filling inlet of a liquid storage tank has an elongated, tubular valve body provided with an inlet at one end and one or more outlets in the sidewall thereof. A single host processor interface is also placed on the chip to connect the multiple DSPs to the host. Methods associated with preparation and use of such compounds, as well as pharmaceutical compositions comprising such compounds, are also disclosed. In some aspects, marking an area of a document, using at least one predetermined markup symbol includes: electronically marking using a medium such as a touchscreen, pressure pad, or a mouse. An output mixer of the current regulating semiconductor device switches, in synchronization with the PWM pulse, between the output of the high-side current detection circuit and the output of the low-side current detection circuit on one signal line to output the output to the microcontroller.