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BU9880GUL-WE2 Datasheet(PDF) 8 Page - Rohm |
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BU9880GUL-WE2 Datasheet(HTML) 8 Page - Rohm |
8 / 17 page Technical Note 8/16 BU9880GUL-W www.rohm.com 2010.11 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. ● Write Command ○ Write cycle ・ Arbitrary data is written to EEPROM. When to write only 1 byte, byte write normally used, and when to write continuous data of 2 bytes or more, simultaneous write is possible by page write cycle. The maximum number of write bytes is specified per device of each capacity.Up to 32 arbitrary bytes can be written. ・ Data is written to the address designated by word address (n-th address). ・ By issuing stop bit after 8bit data input, write to memory cell inside starts. ・ When internal write is started, command is not accepted for tWR (5ms at maximum). ・ By page write cycle, the following can be written in bulk: Up to 32 bytes. (Refer to "Internal address increment of "Notes on page write cycle" in P9/16.) ・ As for page write cycle of BU9880GUL-W , after the significant 7 bits of word address, are designated arbitrarily, by continuing data input of 2 bytes or more, the address of insignificant 5 bits is incremented internally, and data up to 32 bytes can be written. 0 0 * 1 1 0 0 W R I T E S T A R T R / W S T O P 1st WORD ADDRESS DATA SLAVE ADDRESS 0 D0 A C K SDA LINE A C K A C K * WA 12 * WA 0 A C K 2nd WORD ADDRESS D7 Fig.33 Byte write cycle Fig.34 Page write cycle W R I T E S T A R T R / W A C K S T O P 1st WORD ADDRESS(n) SDA LINE A C K A C K DATA(n+31) A C K SLAVE ADDRESS 1 0 0 10 D0 DATA(n) D0 D7 A C K 2nd WORD ADDRESS(n) WA 0 WA 12 * 0 0 * * |
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