参数资料
型号: ATMEGA103-6AI
厂商: Atmel
文件页数: 101/141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
62
ATmega103(L)
0945I–AVR–02/07
the SS pin is brought high. If the SS pin is brought high during a transmission, the SPI
will stop sending and receiving immediately and both data received and data sent must
be considered as lost.
Data Modes
There are four combinations of SCK phase and polarity with respect to serial data that
are determined by control bits CPHA and CPOL. The SPI data transfer formats are
Figure 39. SPI Transfer Format with CPHA = 0 and DORD = 0
Figure 40. SPI Transfer Format with CPHA = 1 and DORD = 0
SPI Control Register – SPCR
Bit 7 – SPIE: SPI Interrupt Enable
This bit causes the SPI interrupt to be executed if SPIF bit in the SPSR Register is set
and the Global Interrupts are enabled.
Bit 6 – SPE: SPI Enable
When the SPE bit is set (one), the SPI is enabled and SS, MOSI, MISO and SCK are
connected to pins PB0, PB1, PB2 and PB3.
MSB
6
5
4
3
2
1
LSB
1
2
3
4
5
6
7
8
MSB
6
5
4
3
2
1
LSB
*
SCK CYCLE #
(FOR REFERENCE)
SCK (CPOL=0)
SCK (CPOL=1)
MOSI
(FROM MASTER)
MISO
(FROM SLAVE)
SS (TO SLAVE)
* Not defined but normally MSB of character just received.
SAMPLE
1
2
3
4
5
6
*
78
SCK CYCLE #
(FOR REFERENCE)
SCK (CPOL=0)
SCK (CPOL=1)
MOSI
(FROM MASTER)
MISO
(FROM SLAVE)
SS (TO SLAVE)
* Not defined but normally LSB of previously transmitted character.
MSB
LSB
MSB
SAMPLE
Bit
7654
321
0
$0D ($2D)
SPIE
SPE
DORD
MSTR
CPOL
CPHA
SPR1
SPR0
SPCR
Read/Write
R/W
Initial Value
0000
000
0
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