Akzo Nobel N.v.

Akzo N.v.

B Edward Ramey

Mario Moreno

A memory control arrangement includes a microcontroller for performing a program memory operation and a data memory operation. The microcontroller produces address signals and a control output indicating first and second operating conditions. A program memory having a first range of memory locations stores a first program and is connected to the address lines for being addressed by the microcontroller. A data memory has second and third ranges of memory locations for storing, respectively, a second program and data for use by program variables. The data memory is connected to the address lines for selectively addressing the second and third ranges of memory locations by the address signals from the microcontroller. A memory range controller is coupled to the control output of the microcontroller for receiving the control signal and is responsive to the first operating condition indicated by the control signal for coupling the address signals to the first range of memory locations in the program memory during the program memory operation of the microcontroller and to the third range of memory locations in the data memory during the data memory operation of the microcontroller. The memory range controller is further responsive to the second operating condition indicated by the control signal for coupling the address signals to the second range of memory locations in the data memory during the program memory operation of the microcontroller and to the third range of memory locations in the data memory during the data memory operation of the controller.

Memory control device for an assay apparatus

A method and apparatus for a liquid level sensor control circuit of a bioassay apparatus for controlling a position of a sampling probe with respect to a surface of a liquid in a container. The apparatus includes a sampling probe, an oscillator circuit coupled to the sampling probe for producing a first output signal having a constant frequency, a comparator coupled to the oscillator circuit for comparing the amplitude of the first output signal to a first reference amplitude and for producing a change signal when the amplitude of the first output signal changes with respect to the reference amplitude, and a controller responsive to the change signal for controlling the position of the sampling probe with respect to the surface of the liquid.

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Durham, NC, United States of America

B Edward Ramey