參數(shù)資料
型號(hào): 24LC32
廠商: Microchip Technology Inc.
英文描述: 32K I 2 C⑩ Serial EEPROM in ISO Micromodule
中文描述: 32K的的I 2 C⑩在ISO微型模塊串行EEPROM
文件頁(yè)數(shù): 13/16頁(yè)
文件大小: 474K
代理商: 24LC32
24LC32A MODULE
DS21225A-page 6
1997 Microchip Technology Inc.
5.0
DEVICE ADDRESSING
A control byte is the rst byte received following the
start condition from the master device. (See Figure 5-
1) The control byte consists of a four bit control code;
for the 24LC32A this is set as 1010 binary for read and
write operations. The next three bits are device select
bits on standard devices, however, for micromodules,
these must be zeros. The last bit of the control byte
denes the operation to be performed. When set to a
one a read operation is selected, and when set to a
zero a write operation is selected. The next two bytes
received dene the address of the rst data byte (see
Figure 5-2). Because only A11...A0 are used, the
upper four address bits must be zeros. The most signif-
icant bit of the most signicant byte of the address is
transferred rst.
Following the start condition, the 24LC32A monitors
the SDA bus checking the device type identier being
transmitted. Upon receiving a valid control byte, the
slave device outputs an acknowledge signal on the
SDA line. Depending on the state of the R/W bit, the
24LC32A will select a read or write operation
FIGURE 5-1:
CONTROL BYTE FORMAT
FIGURE 5-2:
ADDRESS SEQUENCE BIT ASSIGNMENTS
1
0
1
0
S
ACK
R/W
Control Code
Device Select
Bits
Slave Address
Acknowledge Bit
Start Bit
Read/Write Bit
ADDRESS BYTE 1
CONTROL BYTE
Slave
Address
Device
Select
Bus
ADDRESS BYTE 0
1
0
1
0
R/W
0
A
11
A
10
A
9
A
7
A
0
A
8
0
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