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參數(shù)資料
| 型號： | M34C02-RMM1 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | PROM |
| 英文描述： | 256 X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8 |
| 封裝： | 2 X 3 MM, VFDFPN-8 |
| 文件頁數(shù)： | 23/26頁 |
| 文件大?。?/td> | 388K |
| 代理商： | M34C02-RMM1 |
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M34C02
6/26
Figure 6. Setting the Write Protection Register (WC = 0)
Setting the Software Write-Protection
The M34C02 has a hardware write-protection
feature, using the Write Control (WC) signal. This
signal can be driven High or Low, and must be
held constant for the whole instruction sequence.
When Write Control (WC) is held Low, the whole
memory array (addresses 00h to FFh) is write
protected. When Write Control (WC) is held High,
the write protection of the memory array is
dependent on whether software write-protection
has been set.
Software write-protection allows the bottom half of
the memory area (addresses 00h to 7Fh) to be
permanently
write
protected
irrespective
of
subsequent states of the Write Control (WC)
signal.
The write protection feature is activated by writing
once to the Protection Register. The Protection
Register is accessed with the device select code
set to 0110b (as shown in Table 2), and the E2, E1
and E0 bits set according to the states being
applied on the E2, E1 and E0 signals. As for any
other write command, Write Control (WC) needs to
be held Low. Address and data bytes must be sent
with this command, but their values are all ignored,
and are treated as Don’t Care. Once the
Protection Register has been written, the write
protection of the first 128 bytes of the memory is
enabled, and it is not possible to unprotect these
128 bytes, even if the device is powered off and
on, and regardless the state of Write Control (WC).
When the Protection Register has been written,
the M34C02 no longer responds to the device type
identifier 0110b in either read or write mode.
Figure 7. Result of Setting the Write Protection
START
SDA LINE
AI01935B
ACK
WORD
ADDRESS
VALUE
(DON'T CARE)
ACK
DATA
VALUE
(DON'T CARE)
STOP
ACK
CONTROL
BYTE
BUS ACTIVITY
MASTER
BUS ACTIVITY
Default EEPROM memory area
state before write access
to the Protect Register
AI01936C
Standard
Array
FFh
Standard
Array
80h
7Fh
00h
Standard
Array
FFh
Write
Protected
Array
80h
7Fh
00h
State of the EEPROM memory
area after write access
to the Protect Register
Memory
Area
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