参数资料
型号: CAT25512HU5I-GT3
厂商: ON Semiconductor
文件页数: 5/16页
文件大小: 0K
描述: IC EEPROM SRL 512KB I2C 8UDFN
标准包装: 3,000
格式 - 存储器: EEPROMs - 串行
存储器类型: EEPROM
存储容量: 512K (64K x 8)
速度: 20MHz
接口: SPI 3 线串行
电源电压: 1.8 V ~ 5.5 V
工作温度: -40°C ~ 85°C
封装/外壳: 8-UFDFN
供应商设备封装: 8-UDFN(2x3)
包装: 带卷 (TR)
CAT25512
Status Register
The Status Register, as shown in Table 8, contains a
number of status and control bits.
The RDY (Ready) bit indicates whether the device is busy
with a write operation. This bit is automatically set to 1 during
an internal write cycle, and reset to 0 when the device is ready
to accept commands. For the host, this bit is read only.
The WEL (Write Enable Latch) bit is set/reset by the
WREN/WRDI commands. When set to 1, the device is in a
Write Enable state and when set to 0, the device is in a Write
Disable state.
The BP0 and BP1 (Block Protect) bits determine which
blocks are currently write protected. They are set by the user
with the WRSR command and are non ? volatile. The user is
allowed to protect a quarter, one half or the entire memory,
by setting these bits according to Table 9. The protected
blocks then become read ? only.
The WPEN (Write Protect Enable) bit acts as an enable for
the WP pin. Hardware write protection is enabled when the
WP pin is low and the WPEN bit is 1. This condition
prevents writing to the status register and to the block
Table 8. STATUS REGISTER
protected sections of memory. While hardware write
protection is active, only the non ? block protected memory
can be written. Hardware write protection is disabled when
the WP pin is high or the WPEN bit is 0. The WPEN bit, WP
pin and WEL bit combine to either permit or inhibit Write
operations, as detailed in Table 10.
The IPL (Identification Page Latch) bit determines
whether the additional Identification Page (IPL = 1) or main
memory array (IPL = 0) can be accessed both for Read and
Write operations. The IPL bit is set by the user with the
WRSR command and is volatile. The IPL bit is
automatically reset after read/write operations.
The LIP (Lock Identification Page) bit is set by the user
with the WRSR command and is non ? volatile. When set to
1, the Identification Page is permanently write protected
(locked in Read ? only mode).
Note: The IPL and LIP bits cannot be set to 1 using the same
WRSR instruction. If the user attempts to set (“1”) both the
IPL and LIP bit in the same time, these bits cannot be written
and therefore they will remain unchanged.
7
WPEN
6
IPL
5
0
4
LIP
3
BP1
2
BP0
1
WEL
0
RDY
Table 9. BLOCK PROTECTION BITS
Status Register Bits
BP1
0
0
1
1
BP0
0
1
0
1
Array Address Protected
None
C000 ? FFFF
8000 ? FFFF
0000 ? FFFF
Protection
No Protection
Quarter Array Protection
Half Array Protection
Full Array Protection
Table 10. WRITE PROTECT CONDITIONS
WPEN
0
0
1
1
X
X
WP
X
X
Low
Low
High
High
WEL
0
1
0
1
0
1
Protected Blocks
Protected
Protected
Protected
Protected
Protected
Protected
Unprotected Blocks
Protected
Writable
Protected
Writable
Protected
Writable
Status Register
Protected
Writable
Protected
Protected
Protected
Writable
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