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25CSM04 датащи(PDF) 32 Page - Microchip Technology

номер детали 25CSM04
подробное описание детали  4-Mbit SPI Serial EEPROM with 128-Bit Serial Number and Enhanced Write Protection
PDF  55 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

25CSM04 датащи(HTML) 32 Page - Microchip Technology

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25CSM04
DS20005817D-page 32
 2019-2022 Microchip Technology Inc. and its subsidiares
9.2.2
DETERMINING THE LOCK STATE
OF THE SECURITY REGISTER
To determine whether or not the user-programmable
lockable ID page of the Security register is locked, the
25CSM04 includes a CHLK instruction to check the lock
state. To determine the lock status, the opcode 83h
must be clocked into the device on the SI line. The
address bit A10 must be equal to logic ‘1’ while the
other address bits are “don’t care”. Data bit 0 of the
data byte clocked out on the SO line determines the
lock state, the other bits of the data byte are “don’t care”
bits. A data response of xxxxxxx1b indicates the
region is locked, while a xxxxxxx0b response
indicates that the region is not locked.
FIGURE 9-5:
CHECK SECURITY REGISTER LOCK (CHLK) SEQUENCE
Note 1: A23 through A0 are “don’t care” bits, except A10 which must be a logic ‘1’.
CS
SCK
1
0
234
567
8
910 11 12
40 41
39
38
37
36
35
34
33
32
31
30
29
10 0 0 00 11
A A A
RDEX Opcode (83h)
Address Bits A23-A0(1)
XXX X X X
SI
Data Out
SO
MSb
MSb
MSb
High-Impedance
D7
D5 D4 D3 D2 D1 D0
D6
SCK
1
0
234
567
8
910 11 12
40 41
39
38
37
36
35
34
33
32
31
30
29
xxxxxxx1b = Locked
xxxxxxx0b = Unlocked



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