参数资料
型号: ATMEGA103-6AI
厂商: Atmel
文件页数: 99/141页
文件大小: 0K
描述: IC MCU 128K 6MHZ A/D IT 64TQFP
产品培训模块: megaAVR Introduction
标准包装: 90
系列: AVR® ATmega
核心处理器: AVR
芯体尺寸: 8-位
速度: 6MHz
连通性: SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 128KB(64K x 16)
程序存储器类型: 闪存
EEPROM 大小: 4K x 8
RAM 容量: 4K x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 64-TQFP
包装: 托盘
配用: ATSTK501-ND - ADAPTER KIT FOR 64PIN AVR MCU
60
ATmega103(L)
0945I–AVR–02/07
Serial Peripheral
Interface – SPI
The Serial Peripheral Interface (SPI) allows high-speed synchronous data transfer
between the ATmega103(L) and peripheral devices or between several AVR devices.
The ATmega103(L) SPI features include the following:
Full-duplex, Three-wire Synchronous Data Transfer
Master or Slave Operation
LSB First or MSB First Data Transfer
Four Programmable Bit Rates
End-of-Transmission Interrupt Flag
Write Collision Flag Protection
Wake-up from Idle Mode (Slave Mode only)
Figure 37. SPI Block Diagram
The interconnection between Master and Slave CPUs with SPI is shown in Figure 38.
The PB1 (SCK) pin is the clock output in the Master mode and is the clock input in the
Slave mode. Writing to the SPI Data Register of the Master CPU starts the SPI clock
generator, and the data written shifts out of the PB2 (MOSI) pin and into the PB2 (MOSI)
pin of the Slave CPU. After shifting one byte, the SPI clock generator stops, setting the
End-of-Transmission Flag (SPIF). If the SPI interrupt enable bit (SPIE) in the SPCR
Register is set, an interrupt is requested. The Slave Select input, PB0(SS), is set low to
select an individual Slave SPI device. The two Shift Registers in the Master and the
Slave can be considered as one distributed 16-bit circular Shift Register. This is shown
in Figure 38. When data is shifted from the Master to the Slave, data is also shifted in
the opposite direction, simultaneously. This means that during one shift cycle, data in
the Master and the Slave are interchanged.
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