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鍨嬭櫉锛� MCF5270CVM150R2
寤犲晢锛� Freescale Semiconductor
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鎻忚堪锛� IC MCU 32BIT 150MHZ 196-MAPBGA
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 750
绯诲垪锛� MCF527x
鏍稿績铏曠悊鍣細 Coldfire V2
鑺珨灏哄锛� 32-浣�
閫熷害锛� 150MHz
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鎸暕鍣ㄥ瀷锛� 澶栭儴
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灏佽/澶栨锛� 196-LBGA
鍖呰锛� 甯跺嵎 (TR)
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I2C System Configuration
MCF5271 Reference Manual, Rev. 2
Freescale Semiconductor
25-3
Figure 25-1 shows the relationships of the below I2C registers, which are described in
I2C address register (I2ADR)
I2C frequency divider register (I2FDR)
I2C control register (I2CR)
I2C status register (I2SR)
I2C data I/O register (I2DR)
25.4 I2C System Configuration
The I2C module uses a serial data line (I2C_SDA) and a serial clock line (I2C_SCL) for data
transfer. For I2C compliance, all devices connected to these two signals must have open drain or
open collector outputs. The logic AND function is exercised on both lines with external pull-up
resistors.
Out of reset, the I2C default state is as a slave receiver. Thus, when not programmed to be a master
or responding to a slave transmit address, the I2C module should return to the default slave receiver
Normally, a standard communication is composed of four parts: START signal, slave address
transmission, data transfer, and STOP signal. These are discussed in the following sections.
25.4.1 START Signal
When no other device is bus master (both I2C_SCL and I2C_SDA lines are at logic high), a device
can initiate communication by sending a START signal (see A in Figure 25-2). A START signal
is defined as a high-to-low transition of I2C_SDA while I2C_SCL is high. This signal denotes the
beginning of a data transfer (each data transfer can be several bytes long) and awakens all slaves.
Figure 25-2. I2C Standard Communication Protocol
123
4
567
8
1
23
4567
8
9
AD7 AD6 AD5 AD4 AD3 AD2 AD1 R/W
XXX
D7
D6 D5
D4
D3
D2
D1
D0
Calling Address
R/W
ACK
Bit
Data Byte
No
ACK
Bit
STOP
Signal
lsb
msb
lsb
msb
I2C_SDA
I2C_SCL
START
Signal
A
B
D
C
E
F
I2C_SCL held low while
Interrupt is serviced
Interrupt bit set
(Byte complete)
鐩搁棞(gu膩n)PDF璩囨枡
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VI-B2N-IY-F2 CONVERTER MOD DC/DC 18.5V 50W
MC9328MXLVP20R2 IC MCU I.MX 200MHZ 225-MAPBGA
VI-B2M-IY-F4 CONVERTER MOD DC/DC 10V 50W
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