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The first part of the Application Report describes the generation of DTMF signals using the Microcontroller MSP430. Following an explanation of the most important specifications which are involved, the theoretical and mathematical processes will be discussed with which sinusoidal waveforms can be derived from square-wave signals, by making use of appropriate analog filters. Tested examples of software for generating square-wave signals for various timer configurations with the MSP430 are also provided. The chapter concludes with a circuit for deriving DTMF signals from the square-wave signals which have been generated.