mx25l512c Macronix International Co., mx25l512c Datasheet - Page 10

• Manufacturer Part Number: mx25l512c
• Description: 512k-bit [x 1] Cmos Serial Flash
• Manufacturer: Macronix International Co.

(4) Read Status Register (RDSR)
The RDSR instruction is for reading Status Register Bits. The Read Status Register can be read at any time (even in
program/erase/write status register condition) and continuously. It is recommended to check the Write in Progress (WIP)
bit before sending a new instruction when a program, erase, or write status register operation is in progress.
The sequence of issuing RDSR instruction is: CS# goes low→sending RDSR instruction code→Status Register
data out on SO (see Figure. 14)
The definition of the status register bits is as below:
WIP bit. The Write in Progress (WIP) bit, a volatile bit, indicates whether the device is busy in program/erase/write
status register progress. When WIP bit sets to 1, which means the device is busy in program/erase/write status
register progress. When WIP bit sets to 0, which means the device is not in progress of program/erase/write status
register cycle.
WEL bit. The Write Enable Latch (WEL) bit, a volatile bit, indicates whether the device is set to internal write enable
latch. When WEL bit sets to 1, which means the internal write enable latch is set, the device can accept program/
erase/write status register instruction. When WEL bit sets to 0, which means no internal write enable latch; the de-
vice will not accept program/erase/write status register instruction.
BP1, BP0 bits. The Block Protect (BP1, BP0) bits, non-volatile bits, indicate the protected area(as defined in table
1) of the device to against the program/erase instruction without hardware protection mode being set. To write the
Block Protect (BP1, BP0) bits requires the Write Status Register (WRSR) instruction to be executed. Those bits
define the protected area of the memory to against Page Program (PP), Sector Erase (SE), Block Erase (BE) and
Chip Erase(CE) instructions (only if all Block Protect bits set to 0, the CE instruction can be executed)
SRWD bit. The Status Register Write Disable (SRWD) bit, non-volatile bit, is operated together with Write Protec-
tion (WP#) pin for providing hardware protection mode. The hardware protection mode requires SRWD sets to 1
and WP# pin signal is low stage. In the hardware protection mode, the Write Status Register (WRSR) instruction is
no longer accepted for execution and the SRWD bit and Block Protect bits (BP1, BP0) are read only.
Note: 1. See the table "Protected Area Sizes".
P/N: PM1469
SRWD (status
register write
register write
1=status
protect)
disable
bit7
2. The endurance cycles of protect bits are 100,000 cycles; however, the tW time out spec of protect bits is
relaxed as tW = N x 15ms (N is a multiple of 10,000 cycles, ex. N = 2 for 20,000 cycles) after 10,000 cycles
on those bits.
bit6
0
bit5
0
bit4
0
10
protected
(level of
(note 1)
block)
bit3
BP1
protected
(level of
(note 1)
block)
BP0
bit2
MX25L512C
(write enable
0=not write
1=write
enable
enable
latch)
WEL
bit1
REV. 1.0, APR. 14, 2009
0=not in write
progress bit)
operation
operation
(write in
1=write
WIP
bit0