AT88SC0104C datasheet(47/58 Pages) ATMEL

47 / 58 page

5210B–SMIC–11/08

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

8.5.4

System READ: $B6

8.5.4.1

Functional

Figure 8-4.

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, or the

fuses.

8.5.4.2

Read Config Zone

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 memory, the host may provide an authorized

starting address, but a number of bytes N that causes the device to reach unauthorized address.

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 Unauthor-

ized" code ($69 $00) will be returned instead of $90 $00 to indicate that some of the bytes

returned were not valid.

Device

Command

Parameter P1

Parameter P2

Number of Bytes N

Host

N data bytes

Data

...

Data

Table 8-11.

System READ Command Detail

Command

CLA

INS

Read Config Zone

$00

$B6

$00

addr

Read Fuse Byte

$00

$B6

$01

$00

$01

Table 8-12.

System READ

Data Returned

CLA

INS :

Command

Data(1)

...

Data(N)

$B6

7--- ---p0

7 --- n0

7--- ---d0

...

7--- ---d0

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