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HD64F2149YV 데이터시트(PDF) 546 Page - Renesas Technology Corp |
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HD64F2149YV 데이터시트(HTML) 546 Page - Renesas Technology Corp |
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546 / 1075 page ![]() Section 16 I 2C Bus Interface Rev. 3.00 Jan 18, 2006 page 518 of 1044 REJ09B0280-0300 Bit 0—Acknowledge Bit (ACKB): Stores acknowledge data. In transmit mode, after the receiving device receives data, it returns acknowledge data, and this data is loaded into ACKB. In receive mode, after data has been received, the acknowledge data set in this bit is sent to the transmitting device. When this bit is read, in transmission (when TRS = 1), the value loaded from the bus line (returned by the receiving device) is read. In reception (when TRS = 0), the value set by internal software is read. When writing to this bit, acknowledge data that is returned after receiving is rewritten regardless of the TRS value. The data loaded from receiving device is retained, therefore pay attention when using bit-manipulation instructions. Bit 0 ACKB Description 0 Receive mode: 0 is output at acknowledge output timing (Initial value) Transmit mode: Indicates that the receiving device has acknowledged the data (signal is 0) 1 Receive mode: 1 is output at acknowledge output timing Transmit mode: Indicates that the receiving device has not acknowledged the data (signal is 1) |
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