AT88SC0404CA-Y6H-T Atmel, AT88SC0404CA-Y6H-T Datasheet - Page 51

• Manufacturer Part Number: AT88SC0404CA-Y6H-T
• Description: IC EEPROM 4KBIT 4MHZ 8MAP
• Manufacturer: Atmel
• Series: CryptoMemory®r

Specifications of AT88SC0404CA-Y6H-T

• 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: -40°C ~ 85°C
• Package / Case: 8-UDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.8. System READ: $B6
10.8.1. Functional
10.8.2. Read Config Zone
10.8.3. Read Fuse Byte
50
Figure 33. System READ Command Functional Description
The System Read command allows reading of the system data from the device. Depending on the value of the P1
parameter, the host may read the data in the configuration memory, the fuses, or a checksum.
Table 33. System READ Command Detail
To read 256-bytes, the host should set N = $00. This is true for any outgoing command, and is defined by ISO 7816-3.
If the address provided at P2 is an unauthorized address, the device will return the "Command Unauthorized" code
($69 $00) after it has received the header. Since access rights vary throughout the configuration zone, the host may
provide an authorized starting address, but a number of bytes N that causes the device to reach unauthorized data. In
this case, the device will transmit the authorized bytes, but unauthorized bytes will be replaced by the "fuse byte" (see
below). At the end of this command the "Command Unauthorized" code ($69 $00) will be returned instead of $90 $00
to indicate that some of the bytes returned are not valid
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 34. Fuse Byte Definition
Atmel AT88SC0104/0204/0404/0808/CA
Read Config Zone
Read Fuse Byte
Read Checksum
resv
F
7
resv
Number of bytes N
Command
F
Read Command
6
Address 1
Address 2
Host
resv
F
5
resv
Device
F
Data
Data
4
…
CLA
$00
$00
$00
SEC
F
3
$B6
$B6
$B6
INS
N data bytes
PER
$00
$01
$02
P1
F
2
addr
$00
$00
P2
CMA
F
1
$01
$02
®
P3
.
N
8664C–CRYPT–01/10
FAB
Data (N)
F
0