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參數(shù)資料
| 型號： | 24LC41A |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 1K/4K 2.5V Dual Mode, Dual Port IIC Serial EEPROM(1K/4K位,雙模式雙端口，EEPROM) |
| 中文描述： | 1K/4K 2.5V的雙模式，雙端口串行EEPROM國際進口證（1K/4K位，雙模式雙端口器，EEPROM） |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 106K |
| 代理商： | 24LC41A |
1996 Microchip Technology Inc.
Preliminary
DS21176A-page 5
24LC41A
2.1.3
BI-DIRECTIONAL MODE
Before the 24LC41A can be switched into the Bi-direc-
tional Mode (Figure 2-4), it must enter the transition
mode, which is done by applying a valid high to low
transition on the Bi-directional Mode Clock (DSCL). As
soon it enters the transition mode, it looks for a control
byte 1010 000X on the I
2
C
bus, and starts to count
pulses on VCLK. Any high to low transition on the DSCL
line will reset the count. If it sees a pulse count of 128
on VCLK while the DSCL line is idle, it will revert back
to the Transmit-Only Mode, and transmit its contents
starting with the most significant bit in address 00h.
However, if it detects the control byte on the I
2
C bus,
(Figure 2-3) it will switch to the in the Bi-directional
Mode. Once the device has made the transition to the
Bi-directional mode, the only way to switch the device
back to the Transmit-Only Mode is to remove power
from the device. The mode transition process is shown
in detail in Figure 2-4.
Once the device has switched into the Bi-directional
Mode, the VCLK input is disregarded, with the excep-
tion that a logic high level is required to enable write
capability. This mode supports a two-wire Bi-directional
data transmission protocol (I
2
C
)
. In this protocol, a
device that sends data on the bus is defined to be the
transmitter, and a device that receives data from the
bus is defined to be the receiver. The bus must be con-
trolled by a master device that generates the Bi-direc-
tional Mode Clock (DSCL), controls access to the bus
and generates the START and STOP conditions, while
the monitor port acts as the slave. Both master and
slave can operate as transmitter or receiver, but the
master device determines which mode is activated. In
the Bi-directional mode, the monitor port only responds
to commands for device 1010 000X.
2.2
Microcontroller Access Port
The Microcontroller Access Port supports a bi-direc-
tional 2-wire bus and data transmission protocol. A
device that sends data onto the bus is defined as trans-
mitter, and a device receiving data as receiver. The bus
has to be controlled by a master device which gener-
ates the serial clock (MSCL), controls the bus access,
and generates the START and STOP conditions, while
the Microcontroller Access Port works as slave. Both
master and slave can operate as transmitter or receiver,
but the master device determines which mode is acti-
vated.
FIGURE 2-3:
SUCCESSFUL MODE TRANSITION TO BI-DIRECTIONAL MODE
FIGURE 2-4:
MODE TRANSITION WITH RECOVERY TO TRANSMIT-ONLY MODE
Transition Mode with possibility to return to Transmit-Only Mode
Bi-directional
permanently
SCL
SDA
VCLK count = 1 2 n 0
VCLK
Transmit
Only Mode
MODE
S
1
0
1
0
0
0
0
0
ACK
n < 128
TVHZ
SCL
SDA
VCLK
Transmit
Only
MODE
Bi-directional
Recovery to Transmit-Only Mode
Bit8
(MSB of data in 00h)
VCLK count = 1 2 3 4 127 128
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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 |
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