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AT88SC1608-10PI-00 Datasheet(PDF) 10 Page - ATMEL Corporation |
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AT88SC1608-10PI-00 Datasheet(HTML) 10 Page - ATMEL Corporation |
10 / 25 page 10 AT88SC1608 0971G–SMEM–04/04 Read Zone Figure 5. Read Zone Note: z = 0: Read user zone z = 1: Read configuration zone The data byte address is internally incremented following the transmission of each data byte. As long as the AT88SC1608 receives an acknowledge from the host, it will con- tinue to increment the data byte address and serially clock out sequential data bytes. During a read operation, the address will “roll over” from the last byte of the current zone to the first byte of the same zone. If the host is not allowed to read at the specified address, the device will transmit the data byte with all bits equal to “0”. Write Zone Figure 6. Write Zone Note: z = 0: Write user zone z = 1: Write configuration zone The lower four bits of the data byte address are internally incremented following the receipt of each data byte. The higher data byte address bits are not incremented, retain- ing the 16-byte write-page address. Each data byte within a page must only be loaded once. Once a stop condition is issued to indicate the end of the host’s write command, the device initiates the internally timed nonvolatile write cycle. An ACK polling sequence can be initiated immediately. After a write command, if the host is not allowed to write to some address locations, a nonvolatile write cycle will still be initiated. However, the device will only modify data at the allowed addresses. Read Fuses Figure 7. Read Fuses Note: F x = 1: fuse is not blown F x = 0: fuse is blown S T O P A C K A C K A C K S T A R T Command Byte Add (n) Data (n) Data (n+x) N A C K 0 A7 A0 – D7 D0 – D7 D0 – S T O P A C K A C K A C K S T A R T Command Byte Add (n) Data (n) Data (n+x) A7 A0 – D7 D0 – D7 D0 – 1 0 1 1 0 z 0 0 A C K A C K A C K S T A R T Command Fuses Add 1 0 1 1 0 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 F2 F1 F0 N A C K S T O P |
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