参数资料
型号: C8051F002R
厂商: Silicon Laboratories Inc
文件页数: 30/171页
文件大小: 0K
描述: IC 8051 MCU 32K FLASH 32LQFP
标准包装: 1
系列: C8051F00x
核心处理器: 8051
芯体尺寸: 8-位
速度: 20MHz
连通性: SMBus(2 线/I²C),SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,温度传感器,WDT
输入/输出数: 8
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
RAM 容量: 256 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 3.6 V
数据转换器: A/D 4x12b; D/A 2x12b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 32-LQFP
包装: 剪切带 (CT)
其它名称: 336-1002-1
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
17.2.
Operation
Only a SPI master device can initiate a data transfer. The SPI is placed in master mode by setting the Master Enable
flag (MSTEN, SPI0CN.1). Writing a byte of data to the SPI data register (SPI0DAT) when in Master Mode starts a
data transfer. The SPI master immediately shifts out the data serially on the MOSI line while providing the serial
clock on SCK. The SPIF (SPI0CN.7) flag is set to logic 1 at the end of the transfer. If interrupts are enabled, an
interrupt request is generated when the SPIF flag is set. The SPI master can be configured to shift in/out from one
to eight bits in a transfer operation in order to accommodate slave devices with different word lengths. The SPIFRS
bits in the SPI Configuration Register (SPI0CFG.[2:0]) are used to select the number of bits to shift in/out in a
transfer operation.
While the SPI master transfers data to a slave on the MOSI line, the addressed SPI slave device simultaneously
transfers the contents of its shift register to the SPI master on the MISO line in a full-duplex operation. The data
byte received from the slave replaces the data in the master’s data register. Therefore, the SPIF flag serves as both a
transmit-complete and receive-data-ready flag. The data transfer in both directions is synchronized with the serial
clock generated by the master. Figure 17.3 illustrates the full-duplex operation of an SPI master and an addressed
slave.
Figure 17.3. Full Duplex Operation
Receive Buffer
0
1
2
3
4
5
6
7
SPI SHIFT REGISTER
SLAVE DEVICE
MOSI
MISO
NSS
Receive Buffer
0
1
2
3
4
5
6
7
SPI SHIFT REGISTER
MASTER DEVICE
MOSI
MISO
NSS
VDD
Baud Rate
Generator
SCK
Px.y
The SPI data register is double buffered on reads, but not on a write. If a write to SPI0DAT is attempted during a
data transfer, the WCOL flag (SPI0CN.6) will be set to logic 1 and the write is ignored. The current data transfer
will continue uninterrupted. A read of the SPI data register by the system controller actually reads the receive
buffer. If the receive buffer still holds unread data from a previous transfer when the last bit of the current transfer
is shifted into the SPI shift register, a receive overrun occurs and the RXOVRN flag (SPI0CN.4) is set to logic 1.
The new data is not transferred to the receive buffer, allowing the previously received data byte to be read. The data
byte causing the overrun is lost.
When the SPI is enabled and not configured as a master, it will operate as an SPI slave. Another SPI device acting
as a master will initiate a transfer by driving the NSS signal low. The master then shifts data out of the shift register
on the MOSI pin using the its serial clock. The SPIF flag is set to logic 1 at the end of a data transfer (when the
NSS signal goes high).
The slave can load its shift register for the next data transfer by writing to the SPI data
register. The slave must make the write to the data register at least one SPI serial clock cycle before the master
starts the next transmission. Otherwise, the byte of data already in the slave’s shift register will be transferred.
Multiple masters may reside on the same bus. A Mode Fault flag (MODF, SPI0CN.5) is set to logic 1 when the SPI
is configured as a master (MSTEN = 1) and its slave select signal NSS is pulled low. When the Mode Fault flag is
set, the MSTEN and SPIEN bits of the SPI control register are cleared by hardware, thereby placing the SPI module
125
Rev. 1.7
相关PDF资料
PDF描述
PIC18F442-I/P IC MCU FLASH 8KX16 EE A/D 40DIP
PIC32MX340F256H-80I/PT IC PIC MCU FLASH 256K 64-TQFP
PIC16LF874A-I/PT IC PIC MCU FLASH 4KX14 44TQFP
PIC24HJ128GP510-I/PT IC PIC MCU FLASH 128KB 100TQFP
DSPIC33FJ128MC804-I/ML IC DSPIC MCU/DSP 128K 44QFN
相关代理商/技术参数
参数描述
C8051F005 功能描述:8位微控制器 -MCU 32KB 12ADC 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
C8051F005/0046 制造商:Silicon Laboratories Inc 功能描述:
C8051F005DK 功能描述:开发板和工具包 - 8051 MCU DEVELOPMENT KIT W/ US POWER SUPPLY RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:C8051F960, Si7005 核心: 接口类型:USB 工作电源电压:
C8051F005DK-A 功能描述:DEV KIT FOR C8051F005/F006/F007 RoHS:否 类别:编程器,开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK(80-QFP ZIF 插口) 所含物品:面板、缆线、软件、数据表和用户手册 其它名称:520-1035
C8051F005DK-B 功能描述:DEV KIT FOR C8051F005/F006/F007 RoHS:否 类别:编程器,开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK(80-QFP ZIF 插口) 所含物品:面板、缆线、软件、数据表和用户手册 其它名称:520-1035