R1EV5801MB_16 Datasheet, PDF (18/22 Pages) Renesas Technology Corp – 1M EEPROM (128-Kword × 8-bit)Ready Busy and RES function

R1EV5801MB Series
3. Software data protection
To prevent unintentional programming, this device has the software data protection (SDP) mode. The SDP is
enabled by inputting the following 3 bytes code and write data. SDP is not enabled if only the 3 bytes code is input.
To program data in the SDP enable mode, 3 bytes code must be input before write data.
Address
Data
5555
AA
↓
↓
AAAA or 2AAA 55
↓
↓
5555
A0
↓
↓
Write address Write data } Normal data input
The SDP mode is disabled by inputting the following 6 bytes code. Note that, if data is input in the SDP disable
cycle, data can not be written.
Address
5555
↓
AAAA or 2AAA
↓
5555
↓
5555
↓
AAAA or 2AAA
↓
5555
Data
AA
↓
55
↓
80
↓
AA
↓
55
↓
20
The software data protection is not enabled at the shipment.
Note: There are some differences between Renesas Electronics’ and other company’s for enable/disable sequence of
software data protection. If there are any questions , please contact with Rnesas Electronics’ sales offices.
R10DS0209EJ0200 Rev.2.00
May 12, 2016
Page 18 of 20