hn58v256a Renesas Electronics Corporation., hn58v256a Datasheet - Page 19

• Manufacturer Part Number: hn58v256a
• Description: Memory>eeprom>parallel Eeprom
• Manufacturer: Renesas Electronics Corporation.

HN58V256A Series, HN58V257A Series
3. Software data protection
Note: There are some differences between Renesas Technology’s and other company’s for enable/disable
Rev.5.00, Nov. 17.2003, page 19 of 22
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.
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.
The software data protection is not enabled at the shipment.
sequence of software data protection. If there are any questions , please contact with Renesas
Technology’s sales offices.
Write address
Address
2AAA
5555
5555
Address
2AAA
2AAA
5555
5555
5555
5555
Write data }
Data
AA
A0
55
Normal data input
Data
AA
AA
55
80
55
20