Bytes are transferred LSB least significant bit first, so the bits on the left earlier in time are less significant. When the clock goes from low to high, value are actually read. When the clock edge drops low, the values on the line start to change. It then drops low active low to start 8 cylces during which data is simultaneously sent and received. The following pictures show actual signals between a playstation and guitar hero controller configured in analog mode wammy bar sends back 7-bit value 0x7f - 0x The clock is held high until a byte is to be sent. ![]() Please let us know about mistakes! The play station sends a byte at the same time as it receives one full duplex via serial communication. The goal here is to consolidate the information and make it as fast as possible to get up and running.
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