參數(shù)資料
型號: C8051F221R
廠商: Silicon Laboratories Inc
文件頁數(shù): 16/146頁
文件大小: 0K
描述: IC 8051 MCU 8K FLASH 32LQFP
標(biāo)準(zhǔn)包裝: 1
系列: C8051F2xx
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,WDT
輸入/輸出數(shù): 22
程序存儲器容量: 8KB(8K x 8)
程序存儲器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 22x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 32-LQFP
包裝: 剪切帶 (CT)
其它名稱: 336-1009-1
C8051F2xx
112
Rev. 1.6
15.2. 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 accommo-
date 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 simulta-
neously transfers the contents of its shift register to the SPI master on the MISO line in a full-duplex opera-
tion. 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 direc-
tions is synchronized with the serial clock generated by the master. Figure 15.3 illustrates the full-duplex
operation of an SPI master and an addressed slave.
Figure 15.3. 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 cur-
rent data transfer will continue uninterrupted. A read of the SPI data register by the system controller actu-
ally 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.
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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