ATSGA204A データシートの表示（PDF） - Microchip Technology
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ATSGA204A Datasheet PDF : 93 Pages
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ATSHA204A
Device Organization
2.1.1
2.1.2
On shipment from Microchip, the EEPROM contains factory test data that can be used for fixed-value
board testing. This data must be overwritten with the desired contents prior to locking the configuration
and/or data sections of the device. See the Microchip website for the document containing the specific
shipment values.
EEPROM Data Zone
The Data zone is 512-bytes (4 kb), is part of the EEPROM array and can be used for secure storage
purposes.
Prior to locking the configuration section using Lock(Config), the Data zone is inaccessible and can be
neither read nor written. After configuration locking, the entire Data zone can be written using the Write
command. If desired, the data to be written can be encrypted.
In the following table, “Byte Address” is the byte address within the Data zone for the first byte in the
respective slot. Because all Reads and Writes with the ATSHA204A are performed on a word (4-byte or
32-byte) basis and the word address in the table below should be used for the address parameter passed
to the Read and Write commands.
Table 2-3. Data Zone Slots
Slot Byte Address (Hex) Word Address (Hex) Slot Byte Address (Hex) Word Address (Hex)
0
0x0000
0x0000
8
0x0100
0x0040
1
0x0020
0x0008
9
0x0120
0x0048
2
0x0040
0x0010
10
0x0140
0x0050
3
0x0060
0x0018
11
0x0160
0x0058
4
0x0080
5
0x00A0
0x0020
12
0x0180
0x0028
13
0x01A0
0x0060
0x0068
6
0x00C0
7
0x00E0
0x0030
14
0x01C0
0x0038
15
0x01E0
0x0070
0x0078
Configuration Zone
The 88-bytes (704-bits) in the Configuration zone contain manufacturing identification data, general
device and system configuration and access restriction control values for the slots within the Data zone.
The values of these bytes can always be obtained using the Read command. The bytes of this zone are
arranged as shown in the following table.
Table 2-4. Configuration Zone
Word Byte 0
0x00
Byte 1
Byte 2
SN<0:3>
Byte 3
Default
01 23 xx xx
Write Access Read
Access
Never
Always
0x01
RevNum
xx xx xx xx
Never
Always
0x02
SN<4:7>
xx xx xx xx
Never
Always
0x03 SN<8>
Reserved
I2C_Enable Reserved
EE 55 xx 00
Never
Always
0x04 I2C_Address CheckMacConfig OTP Mode
Selector Mode C8 00 55 00
If Config Is Always
unlocked
© 2018 Microchip Technology Inc.
DS40002025A-page 9
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