本帖最后由 butOn 于 2015-4-18 23:25 编辑
请问EXTCOMIN是什么？数据手册没看懂，我只知道两种模式，一种是软件模式COM通过M1写入但这种是不是要不停的写M0并且保持一个频率？硬件模式是不是输入PMW？
VCOM Inversion Periodic VCOM (often known as just COM) inversion impresses a periodic polarity inversion across the panel to keep a latent charge from building up within the Liquid Crystal cell. It can be implemented either through software or through hardware. In either imple- mentation, the positive and negative inversion intervals should be kept as equal as possible, and intervals should not exceed one second. To implement VCOM inversion in software, the M1 bit is periodically toggled. When M1 is 'H' then VCOM = 'H' is output to the panel. If M1 is 'L' then VCOM = 'L' is out- put to the panel. To set the panel for software toggling of M1, tie EXTMODE to VSS as shown in Figure 10. When implementing a VCOM toggle through hard- ware, EXTMODE is set to 'H', and the M1 value becomes XX (don’t care). Hardware then toggles EXTCOMIN, and the timing between toggles of this line sets the VCOM inversion interval. Therefore, it’s important not to allow the toggling interval of EXTCOMIN to exceed one second. To set the panel for software toggling of M1, tie EXTMODE to VDD as shown in Figure 11. |
发表于 2015-4-18 23:25:31
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