W25M02GV
4.4 Write Protect (/WP)
The Write Protect (/WP) pin can be used to prevent the Status Register from being written. Used in
conjunction with the Status Register’s Block Protect bits BP[3:0] and Status Register Protect SRP bits
SRP[1:0], a portion as small as 256K-Byte (2x128KB blocks) or up to the entire memory array can be
hardware protected. The WP-E bit in the Protection Register (SR-1) controls the functions of the /WP pin.
When WP-E=0, the device is in the Software Protection mode that only SR-1 can be protected. The /WP
pin functions as a data I/O pin for the Quad SPI operations, as well as an active low input pin for the Write
Protection function for SR-1. Refer to section 7.1.3 for detail information.
When WP-E=1, the device is in the Hardware Protection mode that /WP becomes a dedicated active low
input pin for the Write Protection of the entire device. If /WP is tied to GND, all “Write/Program/Erase”
functions are disabled. The entire device (including all registers, memory array, OTP pages) will become
read-only. Quad SPI read operations are also disabled when WP-E is set to 1.
4.5 HOLD (/HOLD)
During Standard and Dual SPI operations, the /HOLD pin allows the device to be paused while it is actively
selected. When /HOLD is brought low, while /CS is low, the DO pin will be at high impedance and signals
on the DI and CLK pins will be ignored (don’t care). When /HOLD is brought high, device operation can
resume. The /HOLD function can be useful when multiple devices are sharing the same SPI signals. The
/HOLD pin is active low.
When a Quad SPI Read/Buffer Load command is issued, /HOLD pin will become a data I/O pin for the
Quad operations and no HOLD function is available until the current Quad operation finishes.
4.6 Serial Clock (CLK)
The SPI Serial Clock Input (CLK) pin provides the timing for serial input and output operations. ("See SPI
Operations")
Publication Release Date: July 1, 2015
- 10 -
Preliminary - Revision B
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