This article introduces the MSP430 microcontroller and ISD4004 voice chip as the basis, and designs a multifunctional telephone message system by combining the keyboard controller 74C922 and the peripheral devices of MSP430. Keywords RISC structure Low power consumption Serial peripheral interface (SPI) Quantization noise Automatic squelch MSP430 is a microprocessor recently introduced to China. It has outstanding performance in ultra-low power consumption and is called green MCU by the industry. At the same time, it has a rich internal peripheral modules and is a typical system on chip (SOC). It is also a 16-bit reduced instruction structure with very powerful functions, and is widely used in embedded systems and intelligent devices.
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