參數(shù)資料
型號(hào): MC80C32-30/883:D
廠(chǎng)商: TEMIC SEMICONDUCTORS
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT, 30 MHz, MICROCONTROLLER, CDIP40
文件頁(yè)數(shù): 158/224頁(yè)
文件大?。?/td> 24907K
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39
XMEGA D3 [DATASHEET]
Atmel-8134N-ATxmega32D3-64D3-128D3-192D3-256D3-384D3_datasheet–03/2014
20.
TWI – Two-Wire Interface
20.1
Features
Two Identical two-wire interface peripherals
Bidirectional, two-wire communication interface
Phillips I2C compatible
System Management Bus (SMBus) compatible
Bus master and slave operation supported
Slave operation
Single bus master operation
Bus master in multi-master bus environment
Multi-master arbitration
Flexible slave address match functions
7-bit and general call address recognition in hardware
10-bit addressing supported
Address mask register for dual address match or address range masking
Optional software address recognition for unlimited number of addresses
Slave can operate in all sleep modes, including power-down
Slave address match can wake device from all sleep modes
100kHz and 400kHz bus frequency support
Slew-rate limited output drivers
Input filter for bus noise and spike suppression
Support arbitration between start/repeated start and data bit (SMBus)
Slave arbitration allows support for address resolve protocol (ARP) (SMBus)
20.2
Overview
The two-wire interface (TWI) is a bidirectional, two-wire communication interface. It is I
2C and System Management Bus
(SMBus) compatible. The only external hardware needed to implement the bus is one pull-up resistor on each bus line.
A device connected to the bus must act as a master or a slave. The master initiates a data transaction by addressing a
slave on the bus and telling whether it wants to transmit or receive data. One bus can have many slaves and one or
several masters that can take control of the bus. An arbitration process handles priority if more than one master tries to
transmit data at the same time. Mechanisms for resolving bus contention are inherent in the protocol.
The TWI module supports master and slave functionality. The master and slave functionality are separated from each
other, and can be enabled and configured separately. The master module supports multi-master bus operation and
arbitration. It contains the baud rate generator. Both 100kHz and 400kHz bus frequency is supported. Quick command
and smart mode can be enabled to auto-trigger operations and reduce software complexity.
The slave module implements 7-bit address match and general address call recognition in hardware. 10-bit addressing is
also supported. A dedicated address mask register can act as a second address match register or as a register for
address range masking. The slave continues to operate in all sleep modes, including power-down mode. This enables
the slave to wake up the device from all sleep modes on TWI address match. It is possible to disable the address
matching to let this be handled in software instead.
The TWI module will detect START and STOP conditions, bus collisions, and bus errors. Arbitration lost, errors, collision,
and clock hold on the bus are also detected and indicated in separate status flags available in both master and slave
modes.
It is possible to disable the TWI drivers in the device, and enable a four-wire digital interface for connecting to an external
TWI bus driver. This can be used for applications where the device operates from a different V
CC voltage than used by
the TWI bus.
PORTC and PORTE each has one TWI. Notation of these peripherals are TWIC and TWIE.
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