參數資料
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: 9/27頁
文件大小: 358K
代理商: SLX24C04P
SLx 24C04/P
Semiconductor Group
9
1998-07-27
4
After a START condition, the master always transmits a Command Byte CSW or CSR.
After the acknowledge of the EEPROM a Control Byte follows, its content and the
transmitter depend on the previous Command Byte. The description of the Command
and Control Bytes is shown in
table 2
.
Device Addressing and EEPROM Addressing
The device has an internal address counter which points to the current EEPROM
address.
The address counter is incremented
– after a data byte to be written has been acknowledged, during entry of further data
byte
– during a byte read, thus the address counter points to the following address after
reading a data byte.
Command Byte
Selects operation:
the least significant bit b0 is low for a write
operation (Chip Select Write Command Byte CSW) or set high for a
read operation (Chip Select Read Command Byte CSR).
Contains address information:
in the CSW Command Byte, the
bit position b1 is decoded for the uppermost EEPROM address bit
A8 (in the CSR Command Byte, the bit positions b3 to b1 are left
undefined, in the CSW Command Byte, the bit positions b3 and b2
as well).
Following CSW (b0 = 0):
contains the eight lower bits of the
EEPROM address (EEA) bit A7 to A0, or an additional command
byte for the handling of the protection bit.
Following CSR (b0 = 1):
contains the data read out, transmitted by
the EEPROM. The EEPROM data are read as long as the master
pulls down SDA after each byte in order to acknowledge the
transfer. The read operation is stopped by the master by releasing
SDA (no acknowledge is applied) followed by a STOP condition.
Control Byte
Table 2
Command and Control Byte for
I
2
C-Bus Addressing of Chip and EEPROM
Definition
b7
b6
b5
b4
b3
b2
CSW
1
0
1
0
x
x
CSR
1
0
1
0
x
x
EEA
A7
A6
A5
A4
A3
A2
Function
b1
A8
x
A1
b0
0
1
A0
Chip Select for Write
Chip Select for Read
EEPROM address
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