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M95P16-IXMC/EF Datasheet(PDF) 25 Page - STMicroelectronics

Part # M95P16-IXMC/EF
Description  Ultra low power 16 Mbit serial SPI page EEPROM with dual and quad outputs
PDF  63 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M95P16-IXMC/EF Datasheet(HTML) 25 Page - STMicroelectronics

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6.7
Write Volatile register (81h)
The Write volatile register (WRVR) instruction is used to write the Volatile register, whose writable bits include
BUFEN and BUFLD.
Only the BUFEN bit can be updated, the BUFLD bit is a status bit.
All other bit locations MSB [7:4], LSB[3;2:0] are read-only and are not affected by this instruction.
To write the Volatile register bits, a Write enable (06h) instruction must have been previously executed, or the
device does not accept the volatile register instruction (Status register bit WEL must be set to 1). Once write
enabled, the instruction is entered by driving S low, sending the instruction code 81h, and then the volatile register
data byte. The instruction is completed by driving S high.
The S pin must be driven high after the eighth bit has been latched. If this is not done the WRVR instruction is not
executed.
Figure 13. Write Volatile register
-3
-2
-1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
D7
D6
D5
D4
D3
D2
D1
D0
High impedance
C
D
S
Q
WRVR instruction
Data byte in
MS55404V1
During the Volatile register write operation (06h combined with 81h), after S is driven high, the self-timed Write
register cycle starts and the WRVR time is instantaneous (see Table 26. Programming times). The content of
volatile register is described in Section 5.3 Volatile register format.
M95P16-I M95P16-E
Write Volatile register (81h)
DS13710 - Rev 1
page 25/63



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