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CAT24WC08GYATE13F Datasheet(PDF) 8 Page - Catalyst Semiconductor |
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CAT24WC08GYATE13F Datasheet(HTML) 8 Page - Catalyst Semiconductor |
8 / 14 page CAT24WC01/02/04/08/16 8 Doc. No. 1022, Rev. N © 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 5020 FHD F10 Figure 8. Immediate Address Read Timing SCL SDA 8TH BIT STOP NO ACK DATA OUT 89 SLAVE ADDRESS S A C K DATA N O A C K S T O P P BUS ACTIVITY: MASTER SDA LINE S T A R T Selective Read Selective READ operations allow the Master device to select at random any memory location for a READ operation. The Master device first performs a ‘dummy’ write operation by sending the START condition, slave address and byte address of the location it wishes to read. After the CAT24WC01/02/04/08/16 acknowledge the word address, the Master device resends the START condition and the slave address, this time with the R/ W bit set to one. The CAT24WC01/02/04/08/16 then responds with its acknowledge and sends the 8-bit byte requested. The master device does not send an acknowledge but will generate a STOP condition. Sequential Read The Sequential READ operation can be initiated by either the immediate Address READ or Selective READ operations. After the 24WC01/02/04/08/16 sends initial 8-bit byte requested, the Master will respond with an acknowledge which tells the device it requires more data. The CAT24WC01/02/04/08/16 will continue to output an 8-bit byte for each acknowledge sent by the Master. The operation is terminated when the Master fails to respond with an acknowledge, thus sending the STOP condition. The data being transmitted from the CAT24WC01/02/ 04/08/16 is outputted sequentially with data from address N followed by data from address N+1. The READ operation address counter increments all of the CAT24WC01/02/04/08/16 address bits so that the entire memory array can be read during one operation. If more than the E (where E = 255 for 24WC02, 511 for 24WC04, 1023 for 24WC08, and 2047 for 24WC16) bytes are read out, the counter will “wrap around” and continue to clock out data bytes. If N = E (where E = 127 for the CAT24WC01) the counter will not 'wrap around'. |
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