7.2 Command Set
The command set of CryptoMemory® is expanded compared to that of a Serial EEPROM, as the functionality of CryptoMemory exceeds that of a simple memory device. Each instruction sent to the CryptoMemory must contain four bytes:
- Command
- Address 1
- Address 2
- N
The value of N in the final instruction byte defines the number of additional data bytes to be sent or received from the CryptoMemory device.
|
Command Description |
Command |
ADDR 1 |
ADDR 2 |
N |
Data(N) | |
|---|---|---|---|---|---|---|
|
Write User Zone |
Normal (AT88SC0104C-AT88SC1616C) |
$B0 |
ADDR |
ADDR |
N ≤ $10 |
N bytes |
|
Normal (AT88SC3216C, AT88SC6416C) |
$B0 |
ADDR |
ADDR |
N ≤ $40 |
N bytes | |
|
Normal (AT88SC12816C, AT88SC25616C) |
$B0 |
ADDR |
ADDR |
N ≤ $80 |
N bytes | |
|
With Anti-Tearing (All Devices) |
$B0 |
ADDR |
ADDR |
N ≤ $08 |
N bytes | |
|
Read User Zone |
$B2 |
ADDR |
ADDR |
N | ||
|
System Write |
Write Config Zone (AT88SC0104C-AT88SC1616C) |
$B4 |
$00 |
ADDR |
N ≤ $10 |
N bytes |
|
Write Config Zone (AT88SC3216C, AT88SC6416C) |
$B4 |
$00 |
ADDR |
N ≤ $40 |
N bytes | |
|
Write Config Zone (AT88SC12816C, AT88SC25616C) |
$B4 |
$00 |
ADDR |
N ≤ $80 |
N bytes | |
|
Write Fuses |
$B4 |
$01 |
Fuse ID |
$00 | ||
|
Send Checksum |
$B4 |
$02 |
$00 |
$02 |
2 bytes | |
|
Set User Zone |
$B4 |
$03 |
Zone |
$00 | ||
|
Write Config Zone with Anti-Tearing |
$B4 |
$08 |
ADDR |
N ≤ $08 |
N bytes | |
|
Set User Zone with Anti-Tearing |
$B4 |
$0B |
Zone |
$00 | ||
|
System Read |
Read Conifg Zone |
$B6 |
$00 |
ADDR |
N | |
|
Read Fuse Byte |
$B6 |
$01 |
$00 |
$01 | ||
|
Read Checksum |
$B6 |
$02 |
$00 |
$02 | ||
|
Verify Crypto |
Verify Authentication |
$B8 |
$0X |
$00 |
$10 |
8 random bytes + 8 challenge bytes X = key set (0-3) |
|
Verify Encryption |
$B8 |
$1X |
$00 |
$10 |
8 random bytes + 8 challenge bytes X = key set (0-3) | |
|
Verify Password |
Write Password |
$BA |
$0X |
$00 |
$03 |
3-byte password X = password set (0-7) |
|
Read Password |
$BA |
$1X |
$00 |
$03 |
3-byte password X = password set (0-7) | |