【摘要】 介绍了单片机P89LPC932的SPI总线原理,分析了PCM语音芯片MC14LC5480的功能需求,利用单片机的SPI总线实现和PCM语音芯片的全双工数字语音通信,将不具备标准SPI接口的语音芯片在外部时钟电路的控制下作为SPI主设备,而单片机作为SPI从设备,给出了硬件电路设计。该电路具有稳定、高效等特点。更多还原

【Abstract】 The principle of SPI bus of MCU P89LPC932 is introduced, and functional requirements of Codec chip MC14LC5480 is analyzed. The full duplex digital voice communication between MCU and PCM Codec chip which has no standard SPI interface is actualized. PCM Codec chip controlled by external clock circuit is used as SPI master, and MCU is used as SPI slave. The hardware circuit has good stability and high efficiency.更多还原