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HD6432142 Datasheet(PDF) 617 Page - Renesas Technology Corp |
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HD6432142 Datasheet(HTML) 617 Page - Renesas Technology Corp |
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617 / 1177 page  Section 17 Keyboard Buffer Controller Rev. 4.00 Sep 27, 2006 page 573 of 1130 REJ09B0327-0400 17.3.3 Receive Abort The H8S/2148 Group and H8S/2147N device (system side) can forcibly abort transmission from the device connected to it (keyboard side) in the event of a protocol error, etc. In this case, the system holds the clock low. During reception, the keyboard also outputs a clock for synchronization, and the clock is monitored when the keyboard output clock is high. If the clock is low at this time, the keyboard judges that there is an abort request from the system, and data transmission from the keyboard is aborted. Thus the system can abort reception by holding the clock low for a certain period. A sample receive abort processing flowchart is shown in figure 17.7, and the receive abort timing in figure 17.8. |
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