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ATmega32A bảng dữ liệu(PDF) 176 Page - ATMEL Corporation

tên linh kiện ATmega32A
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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ATmega32A bảng dữ liệu(HTML) 176 Page - ATMEL Corporation

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8155B–AVR–07/09
ATmega32A
20. Two-wire Serial Interface
20.1
Features
• Simple Yet Powerful and Flexible Communication Interface, Only Two Bus Lines Needed
• Both Master and Slave Operation Supported
• Device Can Operate as Transmitter or Receiver
• 7-bit Address Space allows up to 128 Different Slave Addresses
• Multi-master Arbitration Support
• Up to 400 kHz Data Transfer Speed
• Slew-rate Limited Output Drivers
• Noise Suppression Circuitry Rejects Spikes on Bus Lines
• Fully Programmable Slave Address with General Call Support
• Address Recognition causes Wake-up when AVR is in Sleep Mode
20.2
Two-wire Serial Interface Bus Definition
The Two-wire Serial Interface (TWI) is ideally suited for typical microcontroller applications. The
TWI protocol allows the systems designer to interconnect up to 128 different devices using only
two bi-directional bus lines, one for clock (SCL) and one for data (SDA). The only external hard-
ware needed to implement the bus is a single pull-up resistor for each of the TWI bus lines. All
devices connected to the bus have individual addresses, and mechanisms for resolving bus
contention are inherent in the TWI protocol.
Figure 20-1. TWI Bus Interconnection
Device 1
Device 2
Device 3
Device n
SDA
SCL
........
R1
R2
V
CC



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