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The DALI protocol is popular for controlling office white light, while the DMX512 protocol is used in the atrical and entertainment lighting. These controllers send commands to NEC Electronics' 78K0/Ix2 MCU, which in turn, receives the commands, interprets them and drives the HB LEDs accordingly.
Additional information about NEC Electronics' lineup of 8-, 16- and 32-bit microcontrollers can be found at http:// 
NEC demonstrates how to control up to four HED LED channels
USA - NEC Electronics America ( http:// ) will, at Embedded System Conference 20009, demonstrate how to control up to four individual channels of HB LEDs, such as those used in the industrial market, using a DALI controller and a DMX512 controller.