Published:2011/6/15 8:16:00 Author:Michel | Keyword: Micro Controller, Interface Circuit | From:SeekIC
Liquid crystal display system hardware interface circuit mainly contains micro controller,MC9S08AW32, liquid crystal display module LCD, backlight,liquid crystal drive chip HT1621,key module and resistance and capacitance components etc. and it is showed as the figure 1.
In the figure 1, PTC0 ~ PTC2 port of micro controller MC9S08AW32 are connected to liquid crystal drive chip HT1621's chip selecting signal port (CS), write signal control port (WR) and data signals port (DATA)respectively and they connect pull-up resistors to high PWL respectively. Read signal control port (RD) only needs to connect to high PWL via pull-up resistors because there is no necessary to use HT1621's Read operation.The MC9S08AW32 PTE0 ~ PTE7 port connects key module, PTC3 port connects NPN transistor, which is to control back panels.
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