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参数资料
| 型号： | M28C17 |
| 厂商： | 意法半导体 |
| 元件分类： | DRAM |
| 英文描述： | 16K (2K x 8) Parallel EEPROM with Software Data Protection(16K并行EEPROM,软件数据保护) |
| 中文描述： | 16K的（2K × 8）与软件数据保护（16K的并行EEPROM中，软件数据保护并行的EEPROM） |
| 文件页数： | 5/17页 |
| 文件大小： | 164K |
| 代理商： | M28C17 |
AI01509B
WRITE AAh in
Address 555h
WRITE 55h in
Address 2AAh
WRITE A0h in
Address 555h
SDP is set
WRITE AAh in
Address 555h
WRITE 55h in
Address 2AAh
WRITE A0h in
Address 555h
Write Page
(1 up to 64 bytes)
WRITE IN MEMORY
WHEN SDP IS SET
SDP ENABLE ALGORITHM
Page
Write
Instruction
(Note 1)
Page
Write
Instruction
(Note 1)
WRITE
is enabled
Figure 5. Software Data Protection Enable Algorithm and Memory Write
AI01510
WRITE AAh in
Address 555h
WRITE 55h in
Address 2AAh
WRITE 80h in
Address 555h
Unprotected State
WRITE AAh in
Address 555h
WRITE 55h in
Address 2AAh
WRITE 20h in
Address 555h
Page
Write
Instruction
Figure 6. Software Data Protection Disable
Algorithm
Note:
1. MSB Address bits (A6 to A10) differ during these specific Page Write operations.
Software Data Protection
The M28C17 offers a software controlled write
protection facility that allows the user to inhibit all
write modes to the device including the Chip Erase
instruction. This can be useful in protecting the
memory from inadvertent write cycles that may
occur due to uncontrolled bus conditions.
The M28C17 is shipped as standard in the "unpro-
tected" state meaning that the memory contents
can be changed as required by the user. After the
Software Data Protection enable algorithm is is-
sued, the device enters the "Protect Mode" of
operation where no further write commands have
any effect on the memory contents. The device
remains in this mode until a valid Software Data
Protection (SDP) disable sequence is received
whereby the device reverts to its "unprotected"
state. The Software Data Protection is fully non-
volatile and is not changed by power on/off se-
quences.
To enable the Software Data Protection (SDP) the
device requires the user to write (with a Page Write)
three specific data bytes to three specific memory
locations as per Figure 5. Similarly to disable the
Software Data Protection the user has to write
specific data bytes into six different locations as per
Figure 6 (with a Page Write). This complex series
ensures that the user will never enable or disable
the Software Data Protection accidentally.
5/17
M28C17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M28C17-120K1T | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:16K 2K x 8 PARALLEL EEPROM with SOFTWARE DATA PROTECTION |
| M28C17-120K1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:16 Kbit 2K x 8 Parallel EEPROM With Software Data Protection |
| M28C17-120K6T | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:16K 2K x 8 PARALLEL EEPROM with SOFTWARE DATA PROTECTION |
| M28C17-120K6TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:16 Kbit 2K x 8 Parallel EEPROM With Software Data Protection |
| M28C17-120MS1T | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:16K 2K x 8 PARALLEL EEPROM with SOFTWARE DATA PROTECTION |
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