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HD64F2149YV Datasheet(PDF) 566 Page - Renesas Technology Corp |
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HD64F2149YV Datasheet(HTML) 566 Page - Renesas Technology Corp |
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566 / 1075 page  Section 16 I 2C Bus Interface Rev. 3.00 Jan 18, 2006 page 538 of 1044 REJ09B0280-0300 16.3.9 Noise Canceler The logic levels at the SCL and SDA pins are routed through noise cancelers before being latched internally. Figure 16.12 shows a block diagram of the noise canceler circuit. The noise canceler consists of two cascaded latches and a match detector. The SCL (or SDA) input signal is sampled on the system clock, but is not passed forward to the next circuit unless the outputs of both latches agree. If they do not agree, the previous value is held. System clock period Sampling clock C DQ Latch C DQ Latch SCL or SDA input signal Match detector Internal SCL or SDA signal Sampling clock Figure 16.13 Block Diagram of Noise Canceler 16.3.10 Sample Flowcharts Figures 16.13 to 16.16 show sample flowcharts for using the I 2C bus interface in each mode. |
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