TMS320LF2407A DSP与图形点阵式LCM的接口设计

Interface Design for Dot-matrix Graph LCM with TMS320LF2407A DSP

液晶显示模块(LCM)相对于数字信号处理器(DSP),属于慢速设备,两者之间接口的速度匹配非常重要;另外低功耗DSP一般为3.3 V电平芯片,例如TMS320LF2407A,而LCD一般为5 V电平器件,他们之间的接口必须进行电平转换。以图形点阵式液晶显示模块MGLS240128TA为例,介绍内置T6963C控制器的LCM与DS PTMS320LF2407A的接口软、硬件设计方案,并重点对速度匹配、电平转换和字符、汉字显示等问题进行论述,最后给出部分显示程序流程图。

Compared with the Digital Signal Processor （DSP）,the Liquid Crystal Module （LCM） is a slow peripherals, so the speed matching of the interface between them is very important,and since the DSP is 3.3V design,while the LCM works at 5V voltage, the voltage conversion is needed in the interface. The design method to the interface between a DSP TMS320LF2407A and a dot - matrix graph LCM MGLS240128TA using T6963C as controller is presented,including both the hardware and software scheme. Several sixty - four - dollar questions such as voltage conversion, speed matching and page break display are discussed,the flow charts of display are given.