资 源 简 介
As embedded microcontroller-based products become moresophisticated, additional emphasis is being placed on the design andimplementation of their user interfaces. Visually based interfaces arecommonly implemented with LCDs, LEDs, fluorescent displays, andlights. Many of these components can be controlled directly by anapplication’s processor without using additional components. Voicebaseduser interfaces, on the other hand, are often implemented withspeech synthesizers, speech processors, sound generators, and digitalsignal processors which operate in conjunction with an application’smain processor. In addition to a processor dedicated to the generationof speech, designs frequently require a memory device to hold the dataused by the processor, a loudspeaker, and audio amplification circuitry.The added cost for components and space has limited theimplementation of speech-based user interfaces to higher end productsand products for the visually impaired. This application note discussesadding a voice-based user interface to an application based on theMotorola MC68HC(7)05J1A microcontroller. In particular, interfacingmembers of the M68HC05 MCU Family to the Information StorageDevices (ISD) 1000 and 2500 family of voice record/playback devices ishighlighted. The development of an audible thermometer applicationconcludes the discussion.
