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HCS08 bảng dữ liệu(PDF) 210 Page - Motorola, Inc

tên linh kiện HCS08
Giải thích chi tiết về linh kiện  Microcontrollers
PDF  290 Pages
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nhà sản xuất  MOTOROLA [Motorola, Inc]
Trang chủ  http://www.freescale.com
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HCS08 bảng dữ liệu(HTML) 210 Page - Motorola, Inc

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Inter-Integrated Circuit (IIC) Module
MC9S08GB/GT
210
MOTOROLA
13.2.1 IIC Protocol
The IIC bus system uses a serial data line (SDA) and a serial clock line (SCL) for data transfer. All devices
connected to it must have open drain or open collector outputs. A logic AND function is exercised on both
lines with external pull-up resistors. The value of these resistors is system dependent.
Normally, a standard communication is composed of four parts:
•
START signal
•
Slave address transmission
•
Data transfer
•
STOP signal
The STOP signal should not be confused with the CPU STOP instruction. The IIC bus system
communication is described briefly in the following sections and illustrated in Figure 13-3.
Figure 13-3 IIC Bus Transmission Signals
13.2.1.1 START Signal
When the bus is free; i.e., no master device is engaging the bus (both SCL and SDA lines are at logical
high), a master may initiate communication by sending a START signal. As shown in Figure 13-3, a
START signal is defined as a high-to-low transition of SDA while SCL is high. This signal denotes the
beginning of a new data transfer (each data transfer may contain several bytes of data) and brings all slaves
out of their idle states.
SCL
SDA
START
SIGNAL
ACK
BIT
123
4567
8
MSB
LSB
123
4567
8
MSB
LSB
STOP
SIGNAL
NO
SCL
SDA
123
456
7
8
MSB
LSB
1
2
5
678
MSB
LSB
REPEATED
34
99
AD7 AD6 AD5 AD4 AD3 AD2 AD1 R/W
XXX
D7
D6
D5
D4
D3
D2
D1
D0
CALLING ADDRESS
READ/
DATA BYTE
AD7 AD6 AD5 AD4 AD3 AD2 AD1 R/W
AD7 AD6 AD5 AD4 AD3 AD2 AD1 R/W
NEW CALLING ADDRESS
99
XX
ACK
BIT
WRITE
START
SIGNAL
START
SIGNAL
ACK
BIT
CALLING ADDRESS
READ/
WRITE
STOP
SIGNAL
NO
ACK
BIT
READ/
WRITE



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