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参数资料
| 型号： | M28C17-90WK1TR |
| 厂商： | 意法半导体 |
| 元件分类： | 保险丝 |
| 英文描述： | Fuses, 8A 250V T IEC GLASS 5X20 |
| 中文描述： | 16千位2K × 8并行EEPROM，带有软件数据保护 |
| 文件页数： | 5/17页 |
| 文件大小： | 131K |
| 代理商： | M28C17-90WK1TR |
5/17
M28C16B, M28C17B
ignored, and have no effect on the memory con-
tents.
The device remains in this mode until a valid Soft-
ware Data Protection disable sequence is re-
ceived. The device reverts to its “unprotected”
state.
The status of the Software Data Protection (en-
abled or disabled) is represented by a non-volatile
latch, and is remembered across periods of the
power being off.
The Software Data Protection Enable command
consists of the writing of three specific data bytes
to three specific memory locations (each location
being on a different page), as shown in Figure 4.
Similarly to disable the Software Data Protection,
the user has to write specific data bytes into six dif-
ferent locations, as shown in Figure 6. This com-
plex series of operations protects against the
chance of inadvertent enabling or disabling of the
Software Data Protection mechanism.
Figure 4. Software Data Protection Enable Algorithm and Memory Write
Note: 1. The most significant address bits (A10 to A6) differ during these specific Page Write operations.
AI02819
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
Page Write
(1 up to 64 bytes)
Write to Memory
When SDP is SET
SDP Enable Algorithm
Page Write
Timing
(see note 1)
Page Write
Timing
(see note 1)
Write
is Enabled
Physical
Page Write
Instruction
Figure 5. Status Bit Assignment
AI02815
DP
TB
PLTS
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
DP
TB
PLTS
Hi-Z
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
= Data Polling
= Toggle Bit
= Page Load Timer Status
= High impedance
Figure 6. Software Data Protection Disable
Algorithm
AI02820
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
Timing
相关PDF资料 |
PDF描述 |
|---|---|
| M28C256 | 256 Kbit (32Kb x8) Parallel EEPROM with Software Data Protection |
| M28C256-12BS1T | 256 Kbit (32Kb x8) Parallel EEPROM with Software Data Protection |
| M28C256-12BS6T | 256 Kbit (32Kb x8) Parallel EEPROM with Software Data Protection |
| M28C256-12KA1T | 256 Kbit (32Kb x8) Parallel EEPROM with Software Data Protection |
| M28C256-12KA6T | 256 Kbit (32Kb x8) Parallel EEPROM with Software Data Protection |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M28C17-90WK6TR | 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 |
| M28C17A | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:16 Kbit 2Kb x8 Parallel EEPROM |
| M28C17B | 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 |
| M28C256 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:256 Kbit (32Kb x8) Parallel EEPROM with Software Data Protection |
| M28C256-12BS1T | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:256 Kbit (32Kb x8) Parallel EEPROM with Software Data Protection |
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