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ABOV Semiconductor Co., Ltd.
14.2 Two-Pin External Interface
14.2.1 Basic Transmission Packet
• 10-bit packet transmission using two-pin interface.
• 1-packet consists of 8-bit data, 1-bit parity and 1-bit acknowledge.
• Parity is even of ‘1’ for 8-bit data in transmitter.
• Receiver generates acknowledge bit as ‘0’ when transmission for 8-bit data and its parity has no error.
• When transmitter has no acknowledge(Acknowledge bit is ‘1’ at tenth clock), error process is executed in
transmitter.
• When acknowledge error is generated, host PC makes stop condition and transmits command which has
error again.
• Background debugger command is composed of a bundle of packet.
• Start condition and stop condition notify the start and the stop of background debugger command
respectively.
Figure 14.2 10-bit Transmission Packet
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