AT88SC0104C datasheet(33/58 Pages) ATMEL

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5210B–SMIC–11/08

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

7.6.3

System Write : $B4

7.6.3.1

Functional

Figure 7-7.

System Write Command Functional Description

The System Write command allows to writing of configuration data to the device. Depending on

the value of the Address 1 parameter, the host may write data in the configuration memory, pro-

gram the fuses, or set the user zone.

7.6.3.2

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)

In anti-tearing mode the maximum value for N is $08 for all devices. A write may be started in

the middle of an EEPROM page but should not extend past the end of the page. If the address

provided is an unauthorized address, the device will not write the requested data. Since access

rights vary throughout 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.

After this command the host must perform ACK polling.

Device

Command

Address 1

Address 2

Number of Bytes N

Data

...

Data

Host

N data bytes

Table 7-3.

System Write Command Detail

Command Description

Command

Addr 1

Addr 2

Data (N)

Write Config Zone

AT88SC0104C-AT88SC1616C

$B4

$00

addr

≤$10

N bytes

Write Config Zone

AT88SC3216C-AT88SC6416C

$B4

$00

addr

≤$40

N bytes

Write Config Zone

AT88SC12816C-AT88SC25616C

$B4

$00

addr

≤$80

N bytes

Write Fuses

$B4

$01

fuse ID

$00

Set User Zone

$B4

$03

zone

$00

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