Holtek HT95R35 DTMF电话控制方案

Holtek公司的HT95R35 是带DTMF接收器的8位电话通信用MCU, 具有ROM为16K×16、RAM为2112B、I/O为44引脚、Stack数目为8-level、内建三个16位计时器、一个RTC 计时器及四个外部中断触发等功能，除此之外，HT95R35在功能上更提供一个12-bit D/A及SPI/I2C通讯接口，在封装方面则提供64 LQFP的封装型式。利用内建12-bit D/A，搭配SPI/I2C做为与外部Flash Voice ROM通讯接口，可产生多种语音，非常适合带语音功能通讯产品的应用如多功能电话、无线电话、录音机、家庭安防等。本文介绍了HT95R35主要特性和方框图以及SPI,I2C方框图和单端输入与差分输入的应用电路.

The HT95R35 MCU is an 8-bit high performance, RISC architecture microcontroller device specially designed for telephone applications. Device flexibility is enhanced with their internal special features such as power-down and wake-up functions, DTMF generator, DTMF receiver, PFD driver, SPI and I2C interface, audio DAC output, etc. These features combine to ensure applications require a minimum of external components and therefore reduce overall product costs.
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