參數(shù)資料
型號: 935269343557
廠商: NXP SEMICONDUCTORS
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP160
封裝: 28 X 28 MM, 3.40 MM HEIGHT, ROHS COMPLIANT, PLASTIC, SOT322-2, MS-022, QFP-160
文件頁數(shù): 20/143頁
文件大小: 696K
代理商: 935269343557
2004 Aug 25
116
Philips Semiconductors
Product specication
Multimedia bridge, high performance
Scaler and PCI circuit (SPCI)
SAA7146A
7.17
I2C-bus interface
7.17.1
GENERAL DESCRIPTION
The I2C-bus is a simple 2-wire bus for efficient inter-IC
data exchange. Only two bus lines are required: a serial
clock line (SCL) and a serial data line (SDA). It’s a true
multi-master bus including collision detection and
arbitration to prevent data corruption if two or more
masters simultaneously initiate data transfers. Serial clock
synchronization allows devices with different bit rates to
communicate via the same serial bus. The block diagram
is shown in Fig.41.
7.17.2
FUNCTIONAL DESCRIPTION
The I2C-bus performs byte oriented data transfers. Clock
generation and bus control arbitration are controlled by
hardware. The status register (IICSTA) reflects the status
of the interface and the I2C-bus (see Table 110).
An interrupt after execution may be enabled optionally.
The bus clock generator supports clock rates from
5 to 400 kHz.
The I2C-bus interface is programmed through the transfer
control register (IICTRF) which is shown in Table 112.
A write to this register starts the transfer sequence where
up to 3 bytes are transferred: BYTE2, BYTE1 and BYTE0.
Any of these 3 bytes may be disabled or enabled for use
(as data byte or 7-bit address plus RW bit) in three I2C-bus
protocol functions:
START: start/restart and address device
CONT: transfer data and continue
STOP: transfer data and stop.
All bus operations are done via these three functions.
The functional usage of each single byte is defined by the
byte specific attribute information (see Table 113).
Fig.41 Block diagram of I2C-bus serial interface.
handbook, full pagewidth
MGG278
BYTE 0
BYTE 1
BYTE 2
TRANSFER ATTRIBUTES
STATUS REGISTER (IICSTA)
8-BIT SHIFT REGISTER
BUS CLOCK GENERATOR
CONTROL
ARBITRATION AND SYNC LOGIC
SDA
SCL
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