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參數(shù)資料
| 型號： | C8051F010 |
| 廠商： | Cygnal Technologies |
| 英文描述： | 20 MIPS,32k Flash,256 Ram,10bit ADC,64 Pin MCU(20 MIPS,32k 閃速存儲器,256 Ram,10位 ADC,64 腳 MCU) |
| 中文描述： | 20 MIPS的，32K閃存，256羊，10位ADC，64引腳微控制器（20 MIPS的，32K的閃速存儲器，256，羊，10位ADC和64腳微控制器） |
| 文件頁數(shù)： | 124/170頁 |
| 文件大?。?/td> | 1294K |
| 代理商： | C8051F010 |
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Page 124
CYGNAL Integrated Products, Inc.
2001
4.2001; Rev. 1.3
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
PRELIMINARY
17.2.
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.
Operation
Figure 17.3. Full Duplex Operation
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
Receive Buffer
0
1
2
3
4
5
6
7
SPI SHIFT REGISTER
SCK
MOSI
MISO
NSS
Receive Buffer
0
1
2
3
4
5
6
7
SPI SHIFT REGISTER
MASTER DEVICE
SLAVE DEVICE
P3.0
Baud Rate
Generator
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| C8051F010DK | 功能描述:開發(fā)板和工具包 - 8051 Dev Kit for F010-12 RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:C8051F960, Si7005 核心: 接口類型:USB 工作電源電壓: |
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