R1EV58064BXXN Datasheet, PDF (19/25 Pages) Renesas Technology Corp – 64K EEPROM (8-Kword × 8-bit)

R1EV58064BxxN Series/R1EV58064BxxR Series
3. Software data protection
To prevent unintentional programming caused by noise generated by external circuits, this device has the software
data protection function. In software data protection mode, 3 bytes of data must be input before write data as
follows. And these bytes can switch the non-protection mode to the protection mode. SDP is enabled if only the 3
byte code is input.
Address
Data
1555
AA
↓
↓
0AAA
55
↓
↓
1555
A0
↓
↓
Write address Write data } Normal data input
Software data protection mode can be canceled by inputting the following 6 bytes. After that, this device turns to the
non-protection mode and can write data normally. But when the data is input in the canceling cycle, the data cannot be
written.
Address
1555
↓
0AAA
↓
1555
↓
1555
↓
0AAA
↓
1555
Data
AA
↓
55
↓
80
↓
AA
↓
55
↓
20
The software data protection is not enabled at the shipment.
Note: There are some differences between Renesas Technology’s and other company’s for enable/disable sequence of
software data protection. If there are any questions, please contact with Renesas Technology’s sales offices.
R10DS0207EJ0200 Rev.2.00
May 12, 2016
Page 19 of 23