| The ECG device is one of the essential tools which the heart patients with cerebrovascular disease use for monitoring which develops rapidly.In this paper, we present a handled ECG device, which is low-power consumption, low-cost and has the whole basic functions of a typical ECG device. It has three functional modules, which are distance transmission and display, storage, sample and data processing. We used C8051F120, C8051F340 and C8051F360 to realize the three modules, and connected them through UART.The emphasis of this paper is the software and hardware design and realization of display of the device. for the aim of realizing low-power consumption,low-cost LCD module, through comparing by similar goods and its realization scheme in the market, expatiate how to choose MCU and LCD, and get the conclusion of choose C8051F120MCU for display module chip, it holds 100MIPS, low-power, low-voltage, on-chip RAM which capacity is 8k and external memory interface(EMIF) and digital to analog converter(DAC); and choose CITIZEN K3247H-FL for the display module LCD: which is low-power consumption, low-voltage.In Software design, the paper mainly completes several aspects hereinafter: the first is the realization of driver signal of LCD, the second is the realization of FAT, palette and different operation to the XRAM, the third is the realization of display Chinese characters, DBC case, point, horizontal line and vertical line; the fourth is friendly human-computer interface.The main routine is adopted preemptive and foreground/background task scheduled, and guarantee the real-time requirement. The ISR (interrupt service routine) receives and decides the command and data from storage module, besides, through judging system whether is power-fail reset, could get initialization interface logo again, consumer could switch from one interface to another, operate file content and set ECG parameters and display sample signal by key-press.
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