Holtek HT98R068双向无线电对讲机音频解决方案

1、holtek ht98r068双向无线电对讲机音频解决方案盛群（holtek）公司的ht98r068是双向应用专用soc 。在音讯处理功能方面, 包括预加重/去加重，压扩，可程序扰频设定，dtmf 编译码，可程序挑选码编译码 及亚音频之ctcss/dcs编解码。在mcu资源方面, 16kx16 rom、1k bytes ram、34 i/o、内建有8个通道的12位，4个通道的8位，休眠迅速唤醒、凹凸双频系统操作切换、串行传输接口spi与rtc等功能，可削减外围零件、缩小 尺寸及降低成本。主要是用于模拟无线电对讲机产品如 frs, murs, gmrs等市场。本文介绍了ht98r068主要特性和

2、典型应用。the device is an assp mcu for analog two way radio applications such as frs. this device contains an 8-bit mcu, audio processor, adc, dac as well as an operational amplifier for peripheral interfaces. additionally there are external interrupt functions and 16k of otp program memory and 1k of sr

3、am data memory for general mcu control application. the internal audio processor supports various programmable functions. these functions include ctcss/dcss encoding/decoding, dtmf encoding/decoding, scramble/descramble, vox, compandor and so on. by connecting to a suitable rf module, the device pro

4、vides a cost effective and flexible audio rf solution. applications should include products in the leisure radio application area such as general mobile radios, personal mobile radios, multiple user radios etc.ht98r068主要特性：operating voltage: 3v5vup to 0.25s instruction cycle with 16mhz system clocko

5、tp program memory:16k x 16data memory: 1k x8up to 34 bidirectional i/o linesocillator type: external 32768hz crystal - lxtinternal pll to generate the system clockinput reference clock : 32768hzoutput: 2.048mhz x4/x5/x6/x8 (optional)four operational modes: normal, slow, idle, sleepwatchdog timer fun

6、ction with wdt oscillatorreal time clock function8 channel 12-bit a/d converter4 channel 8-bit d/a converterall instructions executed in one or two instruction cyclestable read instructions63 powerful instructionsup to 10-level subroutine nestingbit manipulation instructionlow voltage reset function

7、low voltage detect functionspi interface for external mcu controltwo 8-bit and signal 16-bit programmable timer/event counter with overflow interrupt and prescalerprogrammable frequency divider - pfdpga : 5bit operational amplifier gain setupsub-tone processorctcss/dcs encode/decodein-band-tone processordtmf encoder/decodeselective call encoder/decoderuser defined tone e