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TW2866C Datasheet(PDF) 47 Page - Renesas Technology Corp |
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TW2866C Datasheet(HTML) 47 Page - Renesas Technology Corp |
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47 / 143 page  TW2866C FN8253 Rev. 0.00 Page 47 of 143 February 3, 2012 Host Interface Serial Interface The two wire serial bus interface is used to allow an external micro-controller to write to or read from the data through the TW2866 register. The SCLK is the serial clock and SDAT is the data line. Both lines are pulled high by the resistors connected to VDD. The SADD[1:0] defines two LSB of the slave device address by tying the SADD pins either to VDD or GND. SLAVE ADDRESS R/W 0 1 0 1 0 SADD[1] SADD[0] 1 = Read 0 = Write The TW2866 supports auto index increments in write/read mode if the data are in sequential order. Data transfer rate on the bus is up to 400 Kbits/s. MSB LSB MSB LSB MSB LSB Start Slave address R/WB Ack Index Ack Data Ack Stop SDAT SCLK (a) Write Mode MSB LSB MSB LSB Start Slave address R/WB Ack Index Ack Stop SDAT SCLK MSB LSB MSB LSB Start Slave address R/WB Ack Data NoAck Stop “0” “1” (b) Read Mode FIGURE 39. TIMING CHART OF SERIAL INTERFACE |
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