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CAT25C33U14STE13 Datasheet(PDF) 8 Page - Catalyst Semiconductor |
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CAT25C33U14STE13 Datasheet(HTML) 8 Page - Catalyst Semiconductor |
8 / 11 page Discontinued Parts 8 CAT25C33/65 Doc. No. 1000, Rev. H © 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice Figure 7. WRSR Instruction Timing Figure 6. Write Instruction Timing Note: Dashed Line= mode (1, 1) – – – – Note: Dashed Line= mode (1, 1) — — — — SK SI SO 0 0 0 0 0 0 1 0 ADDRESS D7 D6 D5 D4 D3 D2 D1 D0 012345678 21 22 23 24 25 26 27 28 29 30 31 CS OPCODE DATA IN HIGH IMPEDANCE 0 1 2 345 67 8 10 911 12 13 14 SCK SI MSB HIGH IMPEDANCE DATA IN 15 SO CS 7 6 5 4 3 2 10 00 0 00 0 0 1 OPCODE If the write operation is initiated immediately after the WREN instruction without CS being brought high, the data will not be written to the array because the write enable latch will not have been properly set. Also, for a successful write operation the address of the memory location(s) to be programmed must be outside the protected address field location selected by the block protection level. Byte Write Once the device is in a Write Enable state, the user may proceed with a write sequence by setting the CS low, issuing a write instruction via the SI line, followed by the 16-bit address (the three Most Significant Bits are don’t care for 25C65 and four most significant bits are don't care for 25C33), and then the data to be written. Programming will start after the CS is brought high. Figure 6 illustrates byte write se- quence. During an internal write cycle, all commands will be ignored except the RDSR (Read Status Register) instruction. The Status Register can be read to determine if the write cycle is still in progress. If Bit 0 of the Status Register is set at 1, write cycle is in progress. If Bit 0 is set at 0, the device is ready for the next instruction. Page Write The CAT25C33/65 features page write capability. After the first initial byte the host may continue to write up to 64 bytes of data to the CAT25C33/65. After each byte of data is received, six lower order address bits are internally incremented by one; the high order bits of address will remain constant. The only restriction is that the 64 bytes must reside on the same page. If the address counter reaches the end of the page and clock continues, the counter will “roll over” to the first address of the page and overwrite any data that may have been written. The CAT25C33/65 is automatically returned to the write disable state at the completion of the write cycle. Figure 8 illustrates the page write sequence. To write to the status register, the WRSR instruction should be sent. Only Bit 2, Bit 3 and Bit 7 of the status register can be written using the WRSR instruction. Figure 7 illustrates the sequence of writing to status register. |
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