M25PX16
Instructions
(1)
Table 9.
Bit
Lock Register out
Bit name
Value
Function
b7-b2
Reserved
The Write Lock and Lock Down bits cannot be changed.
Once a ‘1’ is written to the Lock Down bit it cannot be cleared
to ‘0’, except by a power-up.
‘1’
b1
Sector Lock Down
Sector Write Lock
The Write Lock and Lock Down bits can be changed by
writing new values to them.
‘0’
‘1’
‘0’
Write, Program and Erase operations in this sector will not be
executed. The memory contents will not be changed.
b0
Write, Program and Erase operations in this sector are
executed and will modify the sector contents.
1. Values of (b1, b0) after power-up are defined in Section 7: Power-up and power-down.
Figure 16. Read Lock Register (RDLR) instruction sequence and data-out sequence
S
0
1
2
3
4
5
6
7
8
9
10
28 29 30 31 32 33 34 35 36 37 38 39
C
Instruction
24-bit address
23 22 21
MSB
3
2
1
0
DQ0
DQ1
Lock Register Out
High Impedance
2
7
6
5
4
3
1
0
MSB
AI13738
6.10
Read OTP (ROTP)
The device is first selected by driving Chip Select (S) Low. The instruction code for the Read
OTP (ROTP) instruction is followed by a 3-byte address (A23- A0) and a dummy byte. Each
bit is latched in on the rising edge of Serial Clock (C).
Then the memory contents at that address are shifted out on Serial Data output (DQ1).
Each bit is shifted out at the maximum frequency, f max, on the falling edge of Serial Clock
C
(C). The instruction sequence is shown in Figure 17.
The address is automatically incremented to the next higher address after each byte of data
is shifted out.
There is no rollover mechanism with the Read OTP (ROTP) instruction. This means that the
Read OTP (ROTP) instruction must be sent with a maximum of 65 bytes to read, since once
th
th
the 65 byte has been read, the same (65 ) byte keeps being read on the DQ1 pin.
The Read OTP (ROTP) instruction is terminated by driving Chip Select (S) High. Chip
Select (S) can be driven High at any time during data output. Any Read OTP (ROTP)
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