Datasheet

 2012-2018 Microchip Technology Inc. DS20002300C-page 43
MCP7951X/MCP7952X
FIGURE 6-11: PROTECTED EEPROM READ SEQUENCE
FIGURE 6-12: PROTECTED EEPROM UNLOCK AND PAGE WRITE SEQUENCE
SO
SI
SCK
CS
0 2345678910111
01011001
A
1
A
0
76543210
Data Out
High-Impedance
A
3
A
2
Address Byte
12
13 14
15 16
17
18
19
20
21 22 23
Instruction
0000
SI
CS
91011
00011001
76543210
Data Byte 1
SCK
0 23456718
SI
CS
33 34 35 38 39
76543210
Data Byte n (8 max)
SCK
24 26 27 28 29 30 3125
32
76543210
Data Byte 3
76543210
Data Byte 2
36 37
Instruction
Address Byte
A
3
A
1
A
0
A
2
12
13
14 15 16 17 18
19
20 21 22 23
SI
CS
91011
10010000
SCK
0 2345671
8
Instruction
Data Byte
12
13
14 15
01000111
1. UNLOCK
Instruction
with 0x55
Data Byte
SI
CS
91011
10010000
SCK
0 23456718
Instruction
Data Byte
12
13
14 15
10111000
2. UNLOCK
Instruction
with 0xAA
Data Byte
3. IDWRITE
Instruction
0000