M25PX16 Numonyx, M25PX16 Datasheet - Page 23

• Manufacturer Part Number: M25PX16
• Description: 16-mbit, Dual I/o, 4-kbyte Subsector Erase, Serial Flash Memory With 75 Mhz Spi Bus Interface
• Manufacturer: Numonyx

6.2
6.3
Write Disable (WRDI)
The Write Disable (WRDI) instruction
The Write Disable (WRDI) instruction is entered by driving Chip Select (S) Low, sending the
instruction code, and then driving Chip Select (S) High.
The Write Enable Latch (WEL) bit is reset under the following conditions:
Figure 8.
Read Identification (RDID)
The Read Identification (RDID) instruction allows to read the device identification data:
The manufacturer identification is assigned by JEDEC, and has the value 20h for
STMicroelectronics. The device identification is assigned by the device manufacturer, and
indicates the memory type in the first byte (71h), and the memory capacity of the device in
the second byte (15h). The UID contains the length of the following data in the first byte (set
to 10h) and 16 bytes of the optional Customized Factory Data (CFD) content. The CFD
bytes are read-only and can be programmed with customers data upon their demand. If the
customers do not make requests, the devices are shipped with all the CFD bytes
programmed to zero (00h).
Power-up
Write Disable (WRDI) instruction completion
Write Status Register (WRSR) instruction completion
Write lo Lock Register (WRLR) instruction completion
Page Program (PP) instruction completion
Dual Input Fast Program (DIFP) instruction completion
Program OTP (POTP) instruction completion
Subsector Erase (SSE) instruction completion
Sector Erase (SE) instruction completion
Bulk Erase (BE) instruction completion
Manufacturer identification (1 byte)
Device identification (2 bytes)
A Unique ID code (UID) (17 bytes, of which 16 available upon customer request).
Write Disable (WRDI) instruction sequence
S
C
DQ0
DQ1
High Impedance
0
(Figure
1
2
Instruction
8) resets the Write Enable Latch (WEL) bit.
3
4
5
6
7
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