HoltekHT98R068雙向無線電對講機(jī)音頻解決方案

1、    HoltekHT98R068雙向無線電對講機(jī)音頻解決方案        盛群半導(dǎo)體 時間:2011年06月02日     字 體: 大 中 小        關(guān)鍵詞:<"cblue" " target='_blank'>無線通信<"cblue" " targ

2、et='_blank'>對講機(jī)<"cblue" " target='_blank'>MCU<"cblue" " target='_blank'>SOC       <"cblue" " target='_blank'>盛群半導(dǎo)體         

3、;   盛群半導(dǎo)體（Holtek）公司的HT98R068是雙向無線電應(yīng)用專用<"cblue" " title="SOC">SOC <"cblue" " title="MCU">MCU。在音訊處理功能方面, 包括預(yù)加重/去加重，壓擴(kuò)，可程序擾頻設(shè)定，DTMF 編譯碼，可程序選擇碼編譯碼 及亞音頻之CTCSS/DCS編解碼。在MCU資源方面, 16kx16 ROM、1K Bytes RAM、34 I/O、內(nèi)建有8個通道的12位ADC，4個通道的8

4、位DAC，休眠快速喚醒、高低雙頻系統(tǒng)操作切換、串行傳輸接口SPI與RTC等功能，可減少外圍零件、縮小PCB 尺寸及降低成本。主要是用于模擬無線電<"cblue" " title="對講機(jī)">對講機(jī)產(chǎn)品如 FRS, MURS, GMRS等市場。本文介紹了HT98R068主要特性和典型應(yīng)用電路圖。The device is an ASSP MCU for analog two way radio applications such as FRS. This device contains an 8-bit MCU, Audio Proc

5、essor, 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 SRAM Data Memory for general MCU control application. The Internal Audio Processor supports various programmable functions. These

6、 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 provides a cost effective and flexible audio RF solution. Applications should include products in the Leisure Radio application ar

7、ea 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 clockOTP Program Memory:16K x 16Data Memory: 1K x8Up to 34 bidirectional I/O linesOcillator type: external 32768Hz crystal - LXTInter

8、nal PLL to generate the system clockInput reference clock : 32768HzOutput: 2.048MHz x4/x5/x6/x8 (optional)Four operational modes: Normal, Slow, Idle, SleepWatchdog Timer function with WDT oscillatorReal Time Clock function8 channel 12-bit A/D converter4 channel 8-bit D/A converterAll instructions ex

9、ecuted in one or two instruction cyclesTable read instructions63 powerful instructionsUp to 10-level subroutine nestingBit manipulation instructionLow voltage reset functionLow 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 d