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X1205V8 Arkusz danych(PDF) 8 Page - Xicor Inc. |
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X1205V8 Arkusz danych(HTML) 8 Page - Xicor Inc. |
8 / 22 page X1205 – Preliminary Information REV 1.0.9 8/29/02 Characteristics subject to change without notice. 8 of 22 www.xicor.com In the read mode, the device will transmit eight bits of data, release the SDA line, then monitor the line for an acknowledge. If an acknowledge is detected and no stop condition is generated by the master, the device will continue to transmit data. The device will terminate further data transmissions if an acknowledge is not detected. The master must then issue a stop condition to return the device to Standby mode and place the device into a known state. DEVICE ADDRESSING Following a start condition, the master must output a Slave Address Byte. Slave bits ‘1101’ access the CCR. Bit 3 through Bit 1 of the slave byte specify the device select bits. These are set to ‘111’. The last bit of the Slave Address Byte defines the oper- ation to be performed. When this R/W bit is a one, then a read operation is selected. A zero selects a write operation. Refer to Figure 6. After loading the entire Slave Address Byte from the SDA bus, the X1205 compares the device identifier and device select bits with ‘1101111’. Upon a correct compare, the device outputs an acknowledge on the SDA line. Figure 3. Valid Data Changes on the SDA Bus SCL SDA Data Stable Data Change Data Stable Figure 4. Valid Start and Stop Conditions SCL SDA Start Stop Figure 5. Acknowledge Response From Receiver SCL from Master Data Output from Transmitter Data Output from Receiver 8 1 9 Start Acknowledge |
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