SYS68K ISCSI-1 VME FORCE

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跟着信息技术与网络技术的飞速发展，信息交互运用业务给人类日子带来更多的便当，信息终端表现出巨大的市场潜力。但是由于终端用户环境不同，用户信息交互办法可能不同，现在常用的有IP办法、FSK办法以及无线通讯办法等。为了可以前进终端市场竞争力，减少系统开发本钱投入，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芯片完结FSK通讯模块，依据此模块，用户与业务渠道之间进行FSK信息交互，相对于终端来说就是简略的串口通讯。

1　SYS68K ISCSI-1 VME FORCE介绍

　　ATmega48是依据AVR增强型RISC(精简指令集)结构的、低功耗的8位CMOS微控制器。微控制用具有可控制的上电复位和可编程的掉电检测电路、通过标定的片内RC振荡器、片表里18个间断源和5种休眠方式。由于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，然后可以缓解系统在功耗和处理速度之间的敌对。

　　其片内集成了4 KB的系统内可编程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/从机方式的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芯片硬件电路可以完全兼容，完全可以依据软件实践需求灵敏选择AVR芯片，地便当系统的开发与研发。

2　SYS68K ISCSI-1 VME FORCE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控制，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，低功耗操作方式；
◆ 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 ISCSI-1 VME FORCE硬件规划

　　图1为串口转FSK通讯模块电路。系统主要以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芯片进行控制操作，完结FSK通讯。CMX865芯片的IRQN终端与CPU芯片的外部间断0（INT0）相连，确保软件可以选用间断办法接收/发送FSK数据。CMX865芯片的时钟信号、片选信号、照应应对数据信号、接收控制数据信号分别与ATmega48芯片的一般I/O接口引脚相连，CPU可以通过模拟口线办法对CMX865芯片进行控制。

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