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跟着信息技术与网络技术的飞速发展,信息交互运用事务给人类日子带来更多的便利,信息终端表现出巨大的市场潜力。可是因为终端用户环境不同,用户信息交互方法可能不同,现在常用的有IP方法、FSK方法以及无线通讯方法等。为了能够前进终端市场竞争力,减少体系开发本钱投入,通讯模块与终端程序独立规划是较为志向的解决方案。本文选用ATmega48芯片及CMX865芯片结束FSK通讯模块,根据此模块,用户与事务途径之间进行FSK信息交互,相对于终端来说就是简略的串口通讯。
1 SYS68K/CPU-30BE/16/C2介绍
ATmega48是根据AVR增强型RISC(精简指令集)结构的、低功耗的8位CMOS微操控器。微操控用具有可操控的上电复位和可编程的掉电检测电路、经过标定的片内RC振荡器、片表里18个连续源和5种休眠方法。因为其先进的指令集以及单时钟周期指令执行时间,ATmega48的数据吞吐率高达1 MIPS/MHz,作业速度比一般的单片机高出10倍,然后能够缓解体系在功耗和处理速度之间的仇视。
其片内集成了4 KB的体系内可编程Flash、256字节的EEPROM、512字节的SRAM。其外设具有可编程的串行USART接口、可作业于主机/从机方法的SPI串行接口;存在2个具有独立预分频器和比较器功用的8位守时/计数器和1个具有预分频器、比较功用和捕捉功用的16位守时/计数器、具有独立片内振荡器的可编程看门狗守时器等。ATmega48/88/168芯片硬件电路能够兼容,能够根据软件实践需求灵敏挑选AVR芯片,地便利体系的开发与研发。
2 SYS68K/CPU-30BE/16/C2简介
CMX865是CML公司新出的一款DTMF编/解码器/FSK调制解调器复合IC芯片,它选用单个高速串行总线操控,与大多数串行接口兼容。CMX865的主要特征是:
◆ 供电电压2.7~5.5 V,低功耗操作方法;
◆ 支撑V.23、Bell202 FSK 1200 bps编码/解码;
◆ 集成高可靠性DTMF编码器/解码器;
◆ 集成振铃检测功用,支撑语音勘探功用。
3 SYS68K/CPU-30BE/16/C2硬件规划
图1为串口转FSK通讯模块电路。体系主要以AVR单片机ATmega48芯片和CMX865调制/解调芯片为硬件架构,ATmega48芯片运用CBUS总线对CMX865芯片进行操控操作,结束FSK通讯。CMX865芯片的IRQN终端与CPU芯片的外部连续0(INT0)相连,保证软件能够选用连续方法接纳/发送FSK数据。CMX865芯片的时钟信号、片选信号、照顾应对数据信号、接纳操控数据信号别离与ATmega48芯片的一般I/O接口引脚相连,CPU能够经过模仿口线方法对CMX865芯片进行操控。
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