AT88SC0104C datasheet(46/58 Pages) ATMEL

46 / 58 page

5210B–SMIC–11/08

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

8.5.3.2

Write Config Zone

The maximum number of bytes that may be written is as follows:

• $10 for AT88SC0104C through AT88SC1616C (EEPROM page size of 16 bytes)

• $40 for AT88SC3216C and AT88SC6416C (EEPROM page size of 64 bytes)

• $80 for AT88SC12816C and AT88SC25616C (EEPROM page size of 128 bytes)

Each data byte within a page must only be loaded once. In anti-tearing mode the maximum

value for N is $08 for all devices.

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 through-

out the configuration memory, the host may provide an authorized starting address, but a

number of bytes that causes the device to reach unauthorized address. In this case, the device

will prevent the internal write cycle and no bytes will be written in the EEPROM. At the end of the

command the "Command Unauthorized" code ($69 $00) will be returned instead of $90 $00 to

indicate that no write cycle occurred.

8.5.3.3

Write Fuses

The fuses may only be "programmed", that is written from '1' to '0'. The write fuses operation is

only allowed after successfully presenting the secure code (Write 7 password). The fuses must

be blown sequentially: FAB must be blown first, CMA may be blown only if FAB is ‘0’, and PER

only if CMA is ‘0’.

8.5.3.4

Set User Zone

Before reading and writing data in the user zones, the host should select a zone with this com-

mand. At this time the host may choose whether anti-tearing should be active for this zone.

Table 8-9.

Fuse Writing

Fuse

Fuse ID

FAB

$06

CMA

$04

PER

$00

Table 8-10.

System WRITE

CLA

INS :

Command

Data Sent

$B4

p7--- ---p0

n7 --- n0

Data(1)

...

Data(N)

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