AT88SC0104C datasheet(35/58 Pages) ATMEL

35 / 58 page

5210B–SMIC–11/08

AT88SC0104/0204/0404/0808/1616/3216/6416/12816/25616C

7.6.4

System Read : $B6

7.6.4.1

Functional

Figure 7-9.

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 memory, or the fuses.

7.6.4.2

Read Config Zone

The data byte address to be read is defined by address 2 in the command and is internally incre-

mented 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 start-

ing address and a number of bytes N that causes the device to reach unauthorized address. In

this case the device will transmit the fuse byte (see below) in place of unauthorized bytes.

7.6.4.3

Read Fuse Byte

Fuse data is returned in the form of a single byte. Bits 0 to 3 represent the fuse states, a value

of ‘0’ indicates the fuse has been blown. Bits 4 to 7 are not used as security fuses and are

reserved by Atmel.

Device

Read Command

Address 1

Address 2

Number of Bytes N

Host

N data bytes

Data

...

Data

Table 7-6.

System Read Command Description

Command Description

Command

Addr 1

Addr 2

Read Config Zone

$B6

$00

addr

Read Fuse Byte

$B6

$01

$00

$01

Table 7-7.

Read Fuse Bytes

resv

SEC

PER

CMA

FAB

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