AT88SC0104C datasheet(34/58 Pages) ATMEL

34 / 58 page

5210B–SMIC–11/08

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

7.6.3.3

Write Fuses

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

allowed only 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’. After this command the host must perform ACK polling.

7.6.3.4

Set User Zone

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

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

Data written to the configuration memory may be done with anti-tearing enabled by setting

address 1 to $08 of the Write Config Zone command.

To enable anti-tearing for writes to a user zone a Set User Zone command is executed with

address 1 set to $0B. All subsequent Write User Zone commands will be executed with anti-

tearing enabled until the next Set User Zone command. Anti-tearing should be turned off if not

required, as it would otherwise cause more write cycles than necessary.

Figure 7-8.

System Write

Table 7-4.

Fuse Writing

Fuse

Fuse ID

FAB

$06

CMA

$04

PER

$00

Table 7-5.

Anti-Tearing

Command Description

Command

Addr 1

Addr 2

Data (N)

Write Config Zone with Anti-Tearing

$B4

$08

addr

≤$08

N bytes

Set User Zone with Anti-Tearing

$B4

$0B

zone

$00

Command

Address 1

Address 2

Data

Data x N

1011 0100

0000 xxxx

xxxx xxxx

d7--- ---d0

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