參數(shù)資料
型號(hào): C8051F920-GM
廠商: Silicon Laboratories Inc
文件頁(yè)數(shù): 193/330頁(yè)
文件大?。?/td> 0K
描述: IC 8051 MCU 32K FLASH 32-QFN
產(chǎn)品培訓(xùn)模塊: C8051F9xx Lower Power MCUs
Serial Communication Overview
視頻文件: Designing for Low Power Operation
特色產(chǎn)品: C8051F91x/0x MCU Series Development Kit
標(biāo)準(zhǔn)包裝: 73
系列: C8051F9xx
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: SMBus(2 線/I²C),SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,溫度傳感器,WDT
輸入/輸出數(shù): 24
程序存儲(chǔ)器容量: 32KB(32K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 4.25K x 8
電壓 - 電源 (Vcc/Vdd): 0.9 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 23x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 32-VFQFN 裸露焊盤
包裝: 托盤
產(chǎn)品目錄頁(yè)面: 625 (CN2011-ZH PDF)
配用: 336-1473-ND - KIT DEV C8051F920,F921,F930,F931
其它名稱: 336-1470
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C8051F93x-C8051F92x
272
Rev. 1.4
24.3. SPI Slave Mode Operation
When SPIn is enabled and not configured as a master, it will operate as a SPI slave. As a slave, bytes are
shifted in through the MOSI pin and out through the MISO pin by a master device controlling the SCK sig-
nal. A bit counter in the SPIn logic counts SCK edges. When 8 bits have been shifted through the shift reg-
ister, the SPIF flag is set to logic 1, and the byte is copied into the receive buffer. Data is read from the
receive buffer by reading SPInDAT. A slave device cannot initiate transfers. Data to be transferred to the
master device is pre-loaded into the shift register by writing to SPInDAT. Writes to SPInDAT are double-
buffered, and are placed in the transmit buffer first. If the shift register is empty, the contents of the transmit
buffer will immediately be transferred into the shift register. When the shift register already contains data,
the SPI will load the shift register with the transmit buffer’s contents after the last SCK edge of the next (or
current) SPI transfer.
When configured as a slave, SPIn can be configured for 4-wire or 3-wire operation. The default, 4-wire
slave mode, is active when NSSnMD1 (SPInCN.3) = 0 and NSSnMD0 (SPInCN.2) = 1. In 4-wire mode, the
NSS signal is routed to a port pin and configured as a digital input. SPIn is enabled when NSS is logic 0,
and disabled when NSS is logic 1. The bit counter is reset on a falling edge of NSS. Note that the NSS sig-
nal must be driven low at least 2 system clocks before the first active edge of SCK for each byte transfer.
Figure 24.4 shows a connection diagram between two slave devices in 4-wire slave mode and a master
device.
3-wire slave mode is active when NSSnMD1 (SPInCN.3) = 0 and NSSnMD0 (SPInCN.2) = 0. NSS is not
used in this mode, and is not mapped to an external port pin through the crossbar. Since there is no way of
uniquely addressing the device in 3-wire slave mode, SPIn must be the only slave device present on the
bus. It is important to note that in 3-wire slave mode there is no external means of resetting the bit counter
that determines when a full byte has been received. The bit counter can only be reset by disabling and re-
enabling SPIn with the SPIEN bit. Figure 24.3 shows a connection diagram between a slave device in 3-
wire slave mode and a master device.
24.4. SPI Interrupt Sources
When SPIn interrupts are enabled, the following four flags will generate an interrupt when they are set to
logic 1:
All of the following bits must be cleared by software.
1. The SPI Interrupt Flag, SPIFn (SPInCN.7) is set to logic 1 at the end of each byte transfer.
This flag can occur in all SPIn modes.
2. The Write Collision Flag, WCOLn (SPInCN.6) is set to logic 1 if a write to SPInDAT is
attempted when the transmit buffer has not been emptied to the SPI shift register. When this
occurs, the write to SPInDAT will be ignored, and the transmit buffer will not be written.This
flag can occur in all SPIn modes.
3. The Mode Fault Flag MODFn (SPInCN.5) is set to logic 1 when SPIn is configured as a
master, and for multi-master mode and the NSS pin is pulled low. When a Mode Fault occurs,
the MSTENn and SPIENn bits in SPI0CN are set to logic 0 to disable SPIn and allow another
master device to access the bus.
4. The Receive Overrun Flag RXOVRNn (SPInCN.4) is set to logic 1 when configured as a slave,
and a transfer is completed and the receive buffer still holds an unread byte from a previous
transfer. The new byte is not transferred to the receive buffer, allowing the previously received
data byte to be read. The data byte which caused the overrun is lost.
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C8051F920-GMR 功能描述:8位微控制器 -MCU 32KB 10ADC MCU LEAD FREE RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
C8051F920-GQ 功能描述:8位微控制器 -MCU 32KB 10ADC MCU LEAD FREE RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
C8051F920-GQR 功能描述:8位微控制器 -MCU 32KB 10ADC MCU LEAD FREE RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
C8051F921 制造商:SILABS 制造商全稱:SILABS 功能描述:25 MIPS, 8 kB Flash, Ultra Low Power, Capacitive Sensing MCU
C8051F921-F-GM 制造商:Silicon Laboratories Inc 功能描述:32KB,10ADC,24PIN MCU - Rail/Tube 制造商:Silicon Laboratories Inc 功能描述:MCU 32KB FLASH 10BIT ADC 24QFN