AT88SC0104CA_11 ATMEL [ATMEL Corporation], AT88SC0104CA_11 Datasheet - Page 36
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AT88SC0104CA_11
Manufacturer Part Number
AT88SC0104CA_11
Description
Atmel CryptoMemory Specification Datasheet
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT88SC0104CA_11.pdf
(66 pages)
- Current page: 36 of 66
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8.11
8.11.1 Functional
8.11.2 Read Config Zone
8.11.3 Read Fuse Byte
System Read: $B6
Figure 8-13. 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 8-6.
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 CryptoMemory will read, a value of zero 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 8-7.
Command Description
Read Config Zone
Read Fuse Byte
Read Checksum
resv
F
7
Zone Configuration Example
Fuse Byte Definition
Host
Read Command
Address 1
Address 2
Number of bytes N
resv
F
6
resv
F
5
Device
Data
…
Data
Atmel AT88SC0104CA/0204CA/0404CA/0808CA [Datasheet]
resv
F
4
Command
$B6
$B6
$B6
SEC
F
N data bytes
3
Addr 1
$00
$01
$02
PER
F
2
Addr 2
addr
$00
$00
CMA
8664E−CRYPTO−12/11
F
1
$01
$02
FAB
N
N
F
0
36
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