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SW-309 Datasheet During Write mode, the CY22150 will respond with an ACK pulse after every eight bits. This is accomplished by pulling the SDAT line LOW during the N*9th clock cycle, as illustrated in Figure 5. (N = the number of eight-bit segments transmitted.) During Read mode, the ACK pulse afterthe data packetis sent is generated by the master. SW-309 Price The BIOS May Also Be Updating the Screen If using the ElanSC300 microcontroller evaluation board with an LCD standalone, (i.e., not option 1 above) and booting to DOS, note that the BIOS is ac- cessing the Video registers every time it is called to up- date the screen (i.e., typing in debug or from the DOS prompt). If trying to use debug or other programs to modify the Video registers, be aware that they may be modified by the BIOS as well, specifically Ports 3D8h and 3D9h. SW-309 on stock
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