M25PX64 Datasheet, PDF (46/66 Pages) Numonyx B.V – 64-Mbit, dual I/O, 4-Kbyte subsector erase, serial flash memory with 75 MHz SPI bus interface

Instructions
M25PX64
Figure 20. Program OTP (POTP) instruction 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
Data byte 1
DQ0
S
C
23 22 21
MSB
321076543210
MSB
40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55
Data byte 2
Data byte 3
Data byte n
DQ0
7654321076543210
MSB
MSB
76543210
MSB
AI13575
1. A23 to A7 are don't care.
2. 1 ≤ n ≤ 65.
Figure 21. How to permanently lock the 64 OTP bytes
64 data bytes
OTP control byte
Byte Byte Byte
012
Byte Byte
63 64
X X X X X X X bit 0 When bit 0 = 0
the 64 OTP bytes
become read only
Bit 1 to bit 7 are not programmable
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