101
8024A–AVR–04/08
ATmega8HVA/16HVA
18.5
Register Description
18.5.1
SPCR – SPI Control Register
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 if
the Global Interrupt Enable bit in SREG is set.
Bit 6 – SPE: SPI Enable
When the SPE bit is written to one, the SPI is enabled. This bit must be set to enable any SPI
operations.
Bit 5 – DORD: Data Order
When the DORD bit is written to one, the LSB of the data word is transmitted first.
When the DORD bit is written to zero, the MSB of the data word is transmitted first.
Bit 4 – MSTR: Master/Slave Select
This bit selects Master SPI mode when written to one, and Slave SPI mode when written logic
zero. If SS is configured as an input and is driven low while MSTR is set, MSTR will be cleared,
and SPIF in SPSR will become set. The user will then have to set MSTR to re-enable SPI Mas-
ter mode.
Bit 3 – CPOL: Clock Polarity
When this bit is written to one, SCK is high when idle. When CPOL is written to zero, SCK is low
when idle. Refer to Figure 18-3 and Figure 18-4 for an example. The CPOL functionality is sum-
marized below:
Bit 2 – CPHA: Clock Phase
The settings of the Clock Phase bit (CPHA) determine if data is sampled on the leading (first) or
trailing (last) edge of SCK. Refer to Figure 18-3 and Figure 18-4 for an example. The CPOL
functionality is summarized below:
Bit
765
432
10
SPIE
SPE
DORD
MSTR
CPOL
CPHA
SPR1
SPR0
SPCR
Read/Write
R/W
Initial Value
0
Table 18-3.
CPOL Functionality
CPOL
Leading Edge
Trailing Edge
0
Rising
Falling
1
Falling
Rising
Table 18-4.
CPHA Functionality
CPHA
Leading Edge
Trailing Edge
0
Sample
Setup
1
Setup
Sample
相关PDF资料
ATSAM3N4AA-AU MCU FLASH 48-QFP
ATSAM3SD8CA-CU IC MCU 2X256KB CORTEX-M3 100-QFN
ATSAM3U1EB-CU IC MCU 64KB CORTEX-M3 144-TFBGA
ATSAM3X8EA-CU IC MCU 2X256KB CORTEX-M3 144-BGA
ATTINY12V-1SUR IC AVR MCU 1K FLASH 4MHZ 8-SOIC
ATTINY13-20SQR IC MCU AVR 1KB FLASH 20MHZ 8SOIC
ATTINY13A-MMUR MCU AVR 1KB FLASH 20MHZ 10DFN
ATTINY13V-10SUR MCU AVR 1KB FLASH 10MHZ 8SOIC
相关代理商/技术参数
ATMEGA8HVA-4CKUR 功能描述:8位微控制器 -MCU AVR 8KB FLSH 512B EE 1KB SRAM - 4 MHZ RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATMEGA8HVA-4TU 功能描述:8位微控制器 -MCU AVR 8KB, 512B EE 4MHz 1KB SRAM 1.8-9V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATMEGA8HVA-4TUR 功能描述:8位微控制器 -MCU AVR 8KB FLSH 512B EE 1KB SRAM - 4 MHZ RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATMEGA8HVD-4MX 功能描述:8位微控制器 -MCU AVR 8KB, 512B EE 4MHz 1KB SRAM 2.1-8V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATMEGA8L-8AC 功能描述:8位微控制器 -MCU AVR 8K FLASH 512B EE 1K SRAM ADC 3V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATMEGA8L8AI 制造商:Atmel Corporation 功能描述:
ATMEGA8L-8AI 功能描述:8位微控制器 -MCU AVR 8K FLASH 512B EE 1K SRAM ADC 3V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATMEGA8L-8AJ 功能描述:IC MCU AVR 8K 5V 8MHZ 32-TQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器, 系列:AVR® ATmega 标准包装:9 系列:87C 核心处理器:8051 芯体尺寸:8-位 速度:40/20MHz 连通性:UART/USART 外围设备:POR,WDT 输入/输出数:32 程序存储器容量:32KB(32K x 8) 程序存储器类型:OTP EEPROM 大小:- RAM 容量:256 x 8 电压 - 电源 (Vcc/Vdd):4.5 V ~ 5.5 V 数据转换器:- 振荡器型:内部 工作温度:0°C ~ 70°C 封装/外壳:40-DIP(0.600",15.24mm) 包装:管件