參數(shù)資料
型號(hào)： W25Q16DWSNIP
廠商： WINBOND ELECTRONICS CORP
元件分類： PROM
英文描述： 16M X 1 SPI BUS SERIAL EEPROM, PDSO8
封裝： 0.150 INCH, GREEN, PLASTIC, SOIC-8
文件頁(yè)數(shù)： 60/83頁(yè)
文件大?。?/td> 1268K
代理商： W25Q16DWSNIP
W25Q16DW
Publication Release Date: April 01, 2011
- 63 -
Preliminary - Revision A
10.2.37 Read Security Registers (48h)
The Read Security Register instruction is similar to the Fast Read instruction and allows one or more data
bytes to be sequentially read from one of the four security registers. The instruction is initiated by driving
the /CS pin low and then shifting the instruction code “48h” followed by a 24-bit address (A23-A0) and
eight “dummy” clocks into the DI pin. The code and address bits are latched on the rising edge of the CLK
pin. After the address is received, the data byte of the addressed memory location will be shifted out on
the DO pin at the falling edge of CLK with most significant bit (MSB) first. The byte address is
automatically incremented to the next byte address after each byte of data is shifted out. Once the byte
address reaches the last byte of the register (byte FFh), it will reset to 00h, the first byte of the register,
and continue to increment. The instruction is completed by driving /CS high. The Read Security Register
instruction sequence is shown in Figure 36. If a Read Security Register instruction is issued while an
Erase, Program or Write cycle is in process (BUSY=1) the instruction is ignored and will not have any
effects on the current cycle. The Read Security Register instruction allows clock rates from D.C. to a
maximum of FR (see AC Electrical Characteristics).
ADDRESS
A23-16
A15-12
A11-8
A7-0
Security Register #0*
00h
0 0 0 0
Byte Address
Security Register #1
00h
0 0 0 1
0 0 0 0
Byte Address
Security Register #2
00h
0 0 1 0
0 0 0 0
Byte Address
Security Register #3
00h
0 0 1 1
0 0 0 0
Byte Address
*
Please note that Security Register 0 is Reserved by Winbond for future use. It is
recommended to use Security registers 1- 3 before using register 0.
/CS
CLK
DI
(IO
0)
DO
(IO
1)
Mode 0
Mode 3
0
1
2
3
4
5
6
7
Instruction (48h)
High Impedance
8
9
10
28
29
30
31
24-Bit Address
23
22
21
3
2
1
0
Data Out 1
*
/CS
CLK
DI
(IO
0)
32
DO
(IO
1)
33
34
35
36
37
38
39
Dummy Byte
40
41
42
44
45
46
47
48
49
50
51
52
53
54
55
High Impedance
7
6
5
4
3
2
1
0
7
Data Out 2
*
7
6
5
4
3
2
1
0
*
7
6
5
4
3
2
1
0
43
31
0
= MSB
*
Figure 36. Read Security Registers Instruction (SPI Mode only)
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