Electronic Components Datasheet Search |
|
LE25S81MC Datasheet(PDF) 11 Page - ON Semiconductor |
|
LE25S81MC Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 23 page LE25S81MC No.A2287-11/23 3-2. Status register write The information in status registers BP0, BP1, BP2, TB, CMP and SRWP can be rewritten using the status register write command. RDY and WEN are read-only bits and cannot be rewritten. The information in bits BP0, BP1, BP2, TB, CMP and SRWP is stored in the non-volatile memory, and when it is written in these bits, the contents are retained even at power-down. "Figure 7 Status Register Write" shows the timing waveforms of status register write, and Figure 20 shows a status register write flowchart. Consisting of the first and second bus cycles, the status register write command initiates the internal write operation at the rising CS edge after the data has been input following (01h). Erase and program are performed automatically inside the device by status register write so that erasing or other processing is unnecessary before executing the command. By the operation of this command, the information in bits BP0, BP1, BP2, TB, CMP and SRWP can be rewritten. Since bits RDY (bit 0) and WEN (bit 1) of the status register cannot be written, no problem will arise if an attempt is made to set them to any value when rewriting the status register. Status register write ends can be detected by RDY of status register read. To initiate status register write, the logic level of the WP pin must be set high and status register WEN must be set to "1". Figure 7 Status Register Write 3-3. Contents of each status register RDY (Bit0) The RDY register is for detecting the write (program, erase and status register write) end. When it is "1", the device is in a busy state, and when it is "0", it means that write is completed. WEN (bit1) The WEN register is for detecting whether the device can perform write operations. If it is set to "0", the device will not perform the write operation even if the write command is input. If it is set to "1", the device can perform write operations in any area that is not block-protected. WEN can be controlled using the write enable and write disable commands. By inputting the write enable command (06h), WEN can be set to "1"; by inputting the write disable command (04h), it can be set to "0." In the following states, WEN is automatically set to "0" in order to protect against unintentional writing. • At power-on • Upon completion of small sector erase, sector erase or chip erase • Upon completion of page program • Upon completion of status register write * If a write operation has not been performed inside the LE25S81MC because, for instance, the command input for any of the write operations (small sector erase, sector erase, chip erase, page program, or status register write) has failed or a write operation has been performed for a protected address, WEN will retain the status established prior to the issue of the command concerned. Furthermore, its state will not be changed by a read operation. tSRW Self-timed Write Cycle SCK SI High Impedance SO CS DATA 01h 15 0 1 2 3 4 5 6 7 8 Mode3 Mode0 8CLK WP tWPH tWPS MSB |
Similar Part No. - LE25S81MC |
|
Similar Description - LE25S81MC |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |