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參數(shù)資料
| 型號(hào)： | 24LCS21 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 1K 2.5V Dual Mode I 2 C Serial EEPROM |
| 中文描述： | 一千2.5V的雙模式的I 2 C串行EEPROM |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 91K |
| 代理商： | 24LCS21 |
24LCS21
DS21127B-page 8
1996 Microchip Technology Inc.
4.2
Page Write
The write control byte, word address and the first data
byte are transmitted to the 24LCS21 in the same way
as in a byte write. But instead of generating a stop
condition the master transmits up to eight data bytes to
the 24LCS21 which are temporarily stored in the
on-chip page buffer and will be written into the memory
after the master has transmitted a stop condition. After
the receipt of each word, the three lower order address
pointer bits are internally incremented by one. The
higher order five bits of the word address remains
constant. If the master should transmit more than eight
words prior to generating the stop condition, the
address counter will roll over and the previously
received data will be overwritten. As with the byte write
operation, once the stop condition is received an
internal write cycle will begin (Figure 5-2).
It is required that VCLK be held at a logic high level
during command and data transfer in order to program
the device. This applies to both byte write and page
write operation. Note, however, that the VCLK is
ignored during the self-timed program operation.
Changing VCLK from high to low during the self-timed
program operation will not halt programming of the
device.
5.0
ACKNOWLEDGE POLLING
Since the device 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 bus
throughput). Once the stop condition for a write
command has been issued from the master, the device
initiates the internally timed write cycle. ACK polling
can be initiated immediately. This involves the master
sending 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
Did Device
Acknowledge
(ACK = 0)
Send
Write Command
Send Stop
Condition to
Initiate Write Cycle
Send Start
Send Control Byte
with R/W = 0
Next
Operation
No
Yes
FIGURE 5-2: PAGE WRITE
BUS
MASTER
SDA LINE
BUS
CONTROL
BYTE
WORD
ADDRESS (1)
S
T
O
P
S
T
A
R
T
A
C
K
A
C
K
A
C
K
ACTIVITY:
ACTIVITY:
A
C
K
A
C
K
DATA n + 1
DATA n + 7
DATA (n)
P
S
VCLK
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 24LCS41A | 1K/4K 2.5V Dual Mode, Dual Port IIC Serial EEPROM(1K/4K位,2.5V雙模式,雙端口IIC串行EEPROM) |
| 24LCS41 | 1K/4K 2.5V Dual Mode, Dual Port IIC Serial EEPROM(1K/4K位,2.5V雙模式,雙端口IIC串行EEPROM) |
| 24LCS52 | Connectors |
| 24LC52-IP | 2K 2.5V I 2 C Serial EEPROM with Software Write Protect |
| 24LC52-ISN | 2K 2.5V I 2 C Serial EEPROM with Software Write Protect |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 24LCS21A/P | 功能描述:電可擦除可編程只讀存儲(chǔ)器 2.5V Dual Mode RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24LCS21A/S | 制造商:Microchip Technology Inc 功能描述:1K 2.5V DUAL MODE SERIAL EEPRO - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24LCS21A/SN | 功能描述:電可擦除可編程只讀存儲(chǔ)器 2.5V Dual Mode RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24LCS21A/W | 制造商:Microchip Technology Inc 功能描述:1K 2.5V DUAL MODE SERIAL EEPROM WAFER - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24LCS21A/WF | 制造商:Microchip Technology Inc 功能描述:1K 2.5V DUAL MODE SERIAL EEPRO - Gel-pak, waffle pack, wafer, diced wafer on film |
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