9.4.3.1 Functional

Figure 9-2. Write User Zone Command Functional Description

The Write User Zone command $B0 allows data to be written into the device's currently selected user zone (the procedure for selecting a user zone is described in section 9.4.5 System Write: $B4.

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 be loaded once. In Anti-Tearing mode, the maximum value for N is $08 for all devices. A write in Anti-Tearing mode is activated with the set user zone with anti-tearing command (00 B4 0B zz 00); all subsequent writes to the user zone will be in Anti-Tearing mode.

If the host is not allowed to write in the zone, the device will return the “Command Unauthorized” code ($69 $00) after it has received the P3 byte.

Table 9-4. Write User Zone
Write User Zone Command					Data Sent
CLA	INS : Command	P1 : Address 1	P2 : Address 2	P3 : N	Data(1)	...	Data(N)
**	$B0	0000 0000	0a₆-- ---a₀	000n₄ --- n₀	d₇--- ---d₀	...	d₇--- ---d₀