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參數(shù)資料
| 型號： | 24LC41 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 1K/4K 2.5V Dual Mode, Dual Port I 2 C Serial EEPROM |
| 中文描述： | 1K/4K 2.5V的雙模式，雙端口的I 2 C串行EEPROM |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 98K |
| 代理商： | 24LC41 |
1996 Microchip Technology Inc.
DS21140B-page 9
24LC41
5.0
ACKNOWLEDGE POLLING
Acknowledge polling can be done for both the DDC
Monitor Port (when in bi-directional Mode) and the
Microcontroller Access Port.
Since the port will not acknowledge during a write
cycle, this can be used to determine when the cycle is
complete (this feature can be used to maximize but
throughput). Once the stop condition for a write com-
mand has been issued from the master, the device ini-
tiates the internally timed write cycle. ACK polling can
be initiated immediately. This involves the master send-
ing a start condition followed by the control byte for a
write command (R/W=0). If the device is still busy with
the write cycle, then no ACK will be returned. If the
cycle is complete, then the device will return the ACK
and the master can then proceed with the next read or
write command. See Figure 5-1 for the flow diagram.
FIGURE 5-1:
ACKNOWLEDGE POLLING
FLOW
Send
Write Command
Send Stop
Condition to
Initiate Write Cycle
Send Start
Send Control Byte
with R/W = 0
Did Device
Acknowledge
(ACK = 0)
Next
Operation
NO
YES
6.0
WRITE PROTECTION
6.1
DDC Monitor Port
When using the DDC Monitor Port in the bi-directional
Mode, the VCLK/DWP pin operates as the write protect
control pin. Setting VCLK/DWP high allows normal
write operations, while setting VCLK/DWP low prevents
writing to any location in the array. Connecting the
VCLK/DWP pin to V
SS
would allow the DDC Monitor
Port to operate as a serial ROM, although this configu-
ration would prevent using the device in the Transmit-
Only Mode.
6.2
Microcontroller Access Port
The Microcontroller Access Port can be used as a
serial ROM when the MWP pin is connected to V
CC
.
Programming will be inhibited and the entire memory
associated with the Microcontroller Access Port will be
write-protected.
7.0
READ OPERATION
Read operations are initiated in the same way as write
operations with the exception that the R/W bit of the
slave address is set to one. There are three basic types
of read operations: current address read, random read
and sequential read. These operations are identical for
both the DDC Monitor Port (in bi-directional Mode) and
the Microcontroller Access Port and are completely
independent of one another.
7.1
Current Address Read
The port contains an address counter that maintains
the address of the last word accessed, internally incre-
mented by one. Therefore, if the previous access (either
a read or write operation) was to address n, the next
current address read operation would access data from
address n + 1. Upon receipt of the slave address with
R/W bit set to one, the port issues an acknowledge and
transmits the 8-bit data word. The master will not
acknowledge the transfer but does generate a stop con-
dition and the port discontinues transmission (Figure 7-
1).
7.2
Random Read
Random read operations allow the master to access
any memory location in a random manner. To perform
this type of read operation, first the word address must
be set. This is done by sending the word address to the
port as part of a write operation. After the word address
is sent, the master generates a start condition following
the acknowledge. This terminates the write operation,
but not before the internal address pointer is set. The
master then issues the control byte again, but with
the R/W bit set to a one. The port then issues an
acknowledge and transmits the 8-bit data word. The
master will not acknowledge the transfer but does gen-
erate a stop condition and the port discontinues trans-
mission (Figure 7-2).
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 24LC512/S16K | 制造商:Microchip Technology Inc 功能描述:512K, 64K X 8, 2.5V SER EE,IND - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24LC512/W16K | 制造商:Microchip Technology Inc 功能描述:512K, 64K X 8, 2.5V SER EE,IND,WAFER - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24LC512/WF16K | 制造商:Microchip Technology Inc 功能描述:512K, 64K X 8, 2.5V SER EE,IND - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24LC512-E/MF | 功能描述:電可擦除可編程只讀存儲器 64kx8 - 2.5V RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24LC512-E/MS | 制造商:Microchip Technology Inc 功能描述:512K, 64K X 8, 2.5V SER EE, EXT - Rail/Tube 制造商:Microchip Technology Inc 功能描述:IC EEPROM 512KBIT 400KHZ 8MSOP 制造商:Microchip Technology Inc 功能描述:512K, 64K X 8, 2.5V SER EE, EXT, 8 MSOP 3x3mm TUBE |
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