參數(shù)資料
型號: MC9328MX21DVG
廠商: Motorola, Inc.
英文描述: i.MX family of microprocessors
中文描述: i.MX系列微處理器
文件頁數(shù): 82/96頁
文件大小: 1495K
代理商: MC9328MX21DVG
MC9328MX1 Advance Information, Rev. 4
82
Freescale Semiconductor
Specifications
3.20 I
2
C Module
The I
2
C communication protocol consists of seven elements: START, Data Source/Recipient, Data Direction,
Slave Acknowledge, Data, Data Acknowledge, and STOP.
Figure 63. Definition of Bus Timing for I
2
C
3.21 Synchronous Serial Interface
The MC9328MX1 processor contains two identical SSI modules. The transmit and receive sections of the SSI can
be synchronous or asynchronous. In synchronous mode, the transmitter and the receiver use a common clock and
frame synchronization signal. In asynchronous mode, the transmitter and receiver each have their own clock and
frame synchronization signals. Continuous or gated clock mode can be selected. In continuous mode, the clock
runs continuously. In gated clock mode, the clock functions only during transmission. The internal and external
clock timing diagrams are shown in Figure 65 through Figure 67 on page 84.
Normal or network mode can also be selected. In normal mode, the SSI functions with one data word of
I/O per frame. In network mode, a frame can contain between 2 and 32 data words. Network mode is typically used
in star or ring-time division multiplex networks with other processors or codecs, allowing interface to time division
multiplexed networks without additional logic. Use of the gated clock is not allowed in network mode. These
distinctions result in the basic operating modes that allow the SSI to communicate with a wide variety of devices.
Table 39. I
2
C Bus Timing Parameter Table
Ref
No.
Parameter
1.8V +/- 0.10V
3.0V +/- 0.30V
Unit
Minimum
Maximum
Minimum
Maximum
1
Hold time (repeated) START condition
182
160
ns
2
Data hold time
0
171
0
150
ns
3
Data setup time
11.4
10
ns
4
HIGH period of the SCL clock
80
120
ns
5
LOW period of the SCL clock
480
320
ns
6
Setup time for STOP condition
182.4
160
ns
SDA
SCL
1
2
3
4
6
5
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