HN58S65AT-15 HITACHI [Hitachi Semiconductor], HN58S65AT-15 Datasheet - Page 16

• Manufacturer Part Number: HN58S65AT-15
• Description: 64 k EEPROM (8-kword x 8-bit) Ready/Busy function
• Manufacturer: HITACHI [Hitachi Semiconductor]

HN58S65A Series
(1) Protection by CE, OE, WE
To realize the unprogrammable state, the input level of control pins must be held as shown in the table
below.
CE
OE
WE
V
V
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 onry the 3 byte code is 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.
The software data protection is not enabled at the shipment.
Note: There are some differences between Hitachi’s and other company’s for enable/disable sequence
: Don’t care.
CC
SS
: Pull-up to V
: Pull-down to V
of software data protection. If there are any questions , please contact with Hitachi sales
offices.
CC
level.
SS
level.
V
Write address
CC
Address
0AAA
1555
1555
Address
0AAA
0AAA
1555
1555
1555
1555
Write data }
Data
AA
A0
55
V
SS
Normal data input
Data
AA
AA
55
80
55
20
V
CC