AT88SC0404CA-MPTG Atmel, AT88SC0404CA-MPTG Datasheet - Page 37

• Manufacturer Part Number: AT88SC0404CA-MPTG
• Description: CRYPTOMEM 4KBIT 4 ZONE MOD P TWI
• Manufacturer: Atmel
• Series: CryptoMemory®r

Specifications of AT88SC0404CA-MPTG

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 4K (512 x 8)
• Speed: 4MHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: M2 P, Smart Card Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.10. System READ: $B6
8.10.1. Functional
8.10.2. Read Config Zone
8.10.3. Read Fuse Byte
36
Figure 23. System READ Command Functional Description
The System READ command allows reading of system data from the device. Depending on the value of Address 1, the
host may read the data in the configuration zone, or the fuses.
Table 22. Zone Configuration Example
The data byte address to be read is defined by Address 2 in the command and is internally incremented following the
transmission of each data byte. The value N defines how many bytes Atmel
will result in 256-bytes read. If the address provided is an unauthorized address, the device will not ACK the N-byte and
will not return any data. Since access rights vary throughout the configuration zone, the host may provide an authorized
starting address and a number of bytes N that causes the device to reach unauthorized data. In this case the device
will transmit the fuse byte (see below) in place of unauthorized bytes.
Fuse data is returned in the form of a single byte. Bits zero to three represent the fuse states; a value of ‘0’ indicates
the fuse has been blown. Bits four to seven are not used as security fuses and are reserved by Atmel.
Table 23. Fuse Byte Definition
Atmel AT88SC0104/0204/0404/0808/CA
Read Config Zone
Read Fuse Byte
Read Checksum
resv
F
7
Command Description
resv
Number of bytes N
F
Read Command
6
Address 1
Address 2
Host
resv
F
5
resv
Device
F
Data
Data
4
…
Command
$B6
$B6
$B6
SEC
F
3
N data bytes
Addr 1
®
$00
$01
$02
CryptoMemory
PER
F
2
Addr 2
addr
$00
$00
®
will read, a value of zero
CMA
F
1
$01
$02
N
N
8664C–CRYPT–01/10
FAB
F
0