參數(shù)資料
型號: C8051F221R
廠商: Silicon Laboratories Inc
文件頁數(shù): 15/146頁
文件大?。?/td> 0K
描述: IC 8051 MCU 8K FLASH 32LQFP
標準包裝: 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
Rev. 1.6
111
Figure 15.2. SPI Block Diagram
15.1. Signal Descriptions
The four signals used by the SPI (MOSI, MISO, SCK, NSS) are described below.
15.1.1. Master Out, Slave In
The master-out, slave-in (MOSI) signal is an output from a master device and an input to slave devices. It
is used to serially transfer data from the master to the slave. Data is transferred most-significant bit first.
15.1.2. Master In, Slave Out
The master-in, slave-out (MISO) signal is an output from a slave device and an input to the master device.
It is used to serially transfer data from the slave to the master. Data is transferred most-significant bit first.
A SPI slave places the MISO pin in a high-impedance state when the slave is not selected.
15.1.3. Serial Clock
The serial clock (SCK) signal is an output from the master device and an input to slave devices. It is used
to synchronize the transfer of data between the master and slave on the MOSI and MISO lines.
15.1.4. Slave Select
The slave select (NSS) signal is an input used to select the SPI module when in slave mode by a master,
or to disable the SPI module when in master mode. When in slave mode, it is pulled low to initiate a data
transfer and remains low for the duration of the transfer.
Master
Device
MOSI
Slave
Device
NSS
Slave
Device
NSS
Slave
Device
MISO
SCK
P
o
rt
I/O
NSS
VDD
P
o
rt
I/O
P
o
rt
I/O
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