參數(shù)資料
型號: SLX24C04P
廠商: SIEMENS AG
英文描述: 4 Kbit 512 x 8 bit Serial CMOS EEPROMs, I2C Synchronous 2-Wire Bus, Page Protection Mode
中文描述: 4千位512 × 8位串行CMOS EEPROM的,I2C同步2線巴士,頁面保護模式
文件頁數(shù): 19/27頁
文件大?。?/td> 358K
代理商: SLX24C04P
SLx 24C04/P
Semiconductor Group
19
1998-07-27
7.1
The bits of the protection memory can be addressed directly for reading or programming.
A protection bit address corresponds to the lowest address within the respective page
(A4 to A8, A0 to A3 = zero). The status of each protection bit is sensed internally. A
written state (“0”) prevents programming in the associated page. If an already protected
memory page is accidentally addressed for programming, the programming procedure
is suppressed.
The conventional
I
2
C-Bus protocol allows data bytes to be read and programmed only.
Therefore an independent instruction sequence for addressing and manipulation of
protection bits is implemented. For protection bit instructions, the command byte CSW
with its preceding START condition followed by the associated control byte has to be
entered twice (
figures 15
through
17
). The first command byte CSW (with A8) is
followed by the control byte EEA with the bit/page address A0 through A3 always at zero.
The second CSW is required for entering a control byte CTx for protection bit
manipulation. The three control bytes for read, write or erase of a protection bit are listed
below (
table 3
):
Protection Bit Handling
Table 3
Control Byte for Protection Bit Manipulation
Address
Name
b7
b6
CTR
x
x
CTW
x
x
CTE
x
x
Definition
b4
x
x
x
Function
b5
x
x
x
b3
x
x
x
b2
x
x
x
b1
0
0
1
b0
0
1
1
Protection bit read
Protection bit write
Protection bit erase
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