 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
25LC040T Datasheet(PDF) 10 Page - Microchip Technology |
|
||||||||||||||||||||||||||||||
25LC040T Datasheet(HTML) 10 Page - Microchip Technology |
|
|
10 / 22 page  25AA040/25LC040/25C040 DS21204E-page 10 © 2006 Microchip Technology Inc. 3.5 Read Status Register (RDSR) The RDSR instruction provides access to the STATUS register. The STATUS register may be read at any time, even during a write cycle. The STATUS register is formatted as follows: The Write-In-Process (WIP) bit indicates whether the 25XX040 is busy with a write operation. When set to a ‘1’, a write is in progress, when set to a ‘0’, no write is in progress. This bit is read-only. The Write Enable Latch (WEL) bit indicates the status of the write enable latch. When set to a ‘1’, the latch allows writes to the array, when set to a ‘0’, the latch prohibits writes to the array. The state of this bit can always be updated via the WREN or WRDI commands regardless of the state of write protection on the STATUS register. This bit is read-only. The Block Protection (BP0 and BP1) bits indicate which blocks are currently write-protected. These bits are set by the user issuing the WRSR instruction. These bits are nonvolatile. See Figure 3-6 for RDSR timing sequence. 3.6 Write Status Register (WRSR) The WRSR instruction allows the user to select one of four levels of protection for the array by writing to the appropriate bits in the STATUS register. The array is divided up into four segments. The user has the ability to write-protect none, one, two, or all four of the segments of the array. The partitioning is controlled as illustrated in Table 3-2. See Figure 3-7 for WRSR timing sequence. TABLE 3-2: ARRAY PROTECTION FIGURE 3-6: READ STATUS REGISTER SEQUENCE FIGURE 3-7: WRITE STATUS REGISTER SEQUENCE 7654 3 2 1 0 XXXX BP1 BP0 WEL WIP BP1 BP0 Array Addresses Write-Protected 00 none 01 upper 1/4 (0180h-01FFh) 10 upper 1/2 (0100h-01FFh) 11 all (0000h-01FFh) SO SI CS 9 1011 12131415 11 0 0 0 0 00 765 4 2 1 0 Instruction Data from STATUS register High-impedance SCK 0 234567 1 8 3 SO SI CS 9 1011 12131415 01 0 0 0 0 00 765 4 21 0 Instruction Data to STATUS register High-impedance SCK 0 234567 1 8 3 |
Similar Part No. - 25LC040T |
|
Similar Description - 25LC040T |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
