1、32-Bit-Digital Signal ControllerTMS320F2812Transmitter-databuffer registerTransmittershift registerSCI Device #1SCIRXDSCITXDSCITXDSCIRXDSCI Device #28Receiver-databuffer registerReceivershift register8Transmitter-databuffer registerTransmittershift register8Receiver-databuffer registerReceivershift

2、register8(Full Duplex Shown)RX FIFO_0RX FIFO_15RX FIFO_0RX FIFO_15TX FIFO_0TX FIFO_15TX FIFO_0TX FIFO_15StartLSB23457MSBParityStop 1Addr/Data6該位只需在地址位方式出現(xiàn)該位只需在地址位方式出現(xiàn)Stop 2NRZ (nonreturn to zero) formatStart BitLSB of DataMajorityVote下降沿檢測SCIRXDSCICLK(Internal)123456781234567812Note: 8 SCICLK 每個數(shù)據(jù)位L

3、ast DataST SPSTDataSCIRXD/SCITXD幀的一個塊 SPSPLast DataSTAddr SP10位或更多空閑周期10位或更多的空閑周期地址幀跟隨在10位或更多空閑周期后塊中的第一幀 SPSTAddr空閑周期少于10位Last DataSTSTDataSCIRXD/SCITXDBlock of Frames SPSPLast DataSTAddr SP無重要性的空閑周期長度塊中的首個幀是地址.地址位(ADDR/DATA)為1第一個數(shù)據(jù)幀0100 SPSTAddr1SP停頓位外無需額外的空閑位AddressRegisterName0 x007050SCICCRSCI-A

4、 commun. control register0 x007051SCICTL1SCI-A control register 10 x007052SCIHBAUDSCI-A baud register, high byte0 x007053SCILBAUDSCI-A baud register, low byte0 x007054SCICTL2SCI-A control register 2 register0 x007055SCIRXSTSCI-A receive status register0 x007056SCIRXEMUSCI-A receive emulation data bu

5、ffer0 x007057SCIRXBUFSCI-A receive data buffer register0 x007059SCITXBUFSCI-A transmit data buffer register0 x00705ASCIFFTXSCI-A FIFO transmit register0 x00705BSCIFFRXSCI-A FIFO receive register0 x00705CSCIFFCTSCI-A FIFO control register0 x00705FSCIPRISCI-A priority control registerADDR/IDLEMODESTOP

6、BITSEVEN/ODDPARITYPARITYENABLELOOP BACKENABLESCICHAR2SCICHAR1SCICHAR0Communications Control Register (SCICCR) 0 x007050終了位個數(shù)終了位個數(shù)0 = 1 終了位終了位1 = 2 終了位終了位偶偶/奇極性選擇奇極性選擇0 = 奇極性奇極性1 = 偶極性偶極性SCI極性使能極性使能0 = Disabled1 = Enabled回送測試方式回送測試方式使能位使能位0 = Disabled1 = Enabled多處置方式控制位多處置方式控制位0 = 空閑線方式空閑線方式1 = 地址位方式

7、地址位方式76543210字符長度控制位字符長度控制位# of data bits = (binary + 1)e.g. 110b gives 7 data bitsSCI-B Communications Control Register (SCICCR) 0 x007750TXWAKEreservedRX ERRINT ENASWRESETreservedSLEEPTXENARXENAControl Register 1 (SCICTL1) 0 x007051接納中斷使能位接納中斷使能位0 = 制止接納錯誤中斷制止接納錯誤中斷1 = 啟動接納錯誤中斷啟動接納錯誤中斷SCI 軟件復(fù)位軟件復(fù)位

8、Write 0 = Reset SCIWrite 1 = release from ResetSCI發(fā)送器以喚醒方式選擇控制位發(fā)送器以喚醒方式選擇控制位1 = 所選擇的發(fā)送特征依賴于所選擇的發(fā)送特征依賴于 SCICCR.3 指定的方式指定的方式0 = no wakeup mode 76543210SCI-B Control Register 1 (SCICTL1) 0 x007751SCI睡眠使能位睡眠使能位0 = sleep mode disabled1 = sleep mode enabledSCI發(fā)送器使能發(fā)送器使能0 = transmitter disabled1 = transmit

9、ter enabledSCI 接納器使能接納器使能0 = receiver disabled1 = receiver enabledBAUD15(MSB)BAUD14Baud-Select MSbyte Register (SCIHBAUD) 0 x00705276543210BAUD13BAUD12BAUD11BAUD10BAUD9BAUD8BAUD6Baud-Select LSbyte Register (SCILBAUD) 0 x00705376543210BAUD5BAUD4BAUD3BAUD2BAUD1BAUD7BAUD0(LSB)SCI baud rate =LSPCLK(BRR

10、+ 1) x 8LSPCLK16,BRR = 1 to 65535,BRR = 0SCI-B Baud-Select MSbyte Register (SCIHBAUD) 0 x007752SCI-B Baud-Select LSbyte Register (SCILBAUD) 0 x007753TXRDYTX EMPTYRX/BKINT ENA0TXINT ENA1765 - 2reserved發(fā)送器緩沖發(fā)送器緩沖存放器就緒標(biāo)志存放器就緒標(biāo)志SCI TX READY 0 = SCITXBUF 滿滿 1 = SCITXBUF空，預(yù)備接納下一個字符空，預(yù)備接納下一個字符發(fā)送器空標(biāo)志發(fā)送器空標(biāo)志S

11、CI TX EMPTY0 = 發(fā)送緩沖發(fā)送緩沖TXBUF或移位存放器都裝載了數(shù)據(jù)或移位存放器都裝載了數(shù)據(jù) 1 = 發(fā)送緩沖存放器和移位存放器都空發(fā)送緩沖存放器和移位存放器都空reserved15 - 8SCI-B Control Register 2(SCICTL2) 0 x007754SCITXBUF存放器中斷使能位存放器中斷使能位SCI TX INT ENA 0 = Disable TXRDY interrupt 1 = Enable TXRDY interrupt接納器緩沖接納器緩沖/中斷使能中斷使能SCI RX/BK INT ENA 0 = Disable RXRDY/BRKDT in

12、terrupt 1 = Enable RXRDY/BRKDT interruptSCI-B Receiver Status Register (SCIRXST) 0 x007755OERXERRORRXRDYBRKDTFEPERXWAKEreserved接納器錯誤標(biāo)志位接納器錯誤標(biāo)志位0 = No error flags set1 = Error flag(s) set接納器就緒標(biāo)志位接納器就緒標(biāo)志位0 = SCIRXBUF中無新的字符中無新的字符1 = SCIRXBUF有新的字符預(yù)備被讀入有新的字符預(yù)備被讀入SCI中斷檢測標(biāo)志位中斷檢測標(biāo)志位1 = 中斷條件產(chǎn)生中斷條件產(chǎn)生0 = 無中斷條件

13、產(chǎn)生無中斷條件產(chǎn)生 76543210幀錯誤標(biāo)志幀錯誤標(biāo)志1 = 檢測到幀錯誤檢測到幀錯誤溢出錯誤標(biāo)志溢出錯誤標(biāo)志1 = 檢測到溢出錯誤檢測到溢出錯誤奇偶極性錯誤標(biāo)志奇偶極性錯誤標(biāo)志1 = 檢測到奇偶極性錯誤檢測到奇偶極性錯誤接納器喚醒檢測標(biāo)志接納器喚醒檢測標(biāo)志1 = 檢測到接納器喚醒條檢測到接納器喚醒條件件0TXFFIL2SCIFFENATXFFST0TXFFST3TXFFIENA123456789101112131415TXFFIL0TXFFIL1TXFFIL4TXFFIL3TXFFST1TXFFINTCLRTXFFST2TXFFINTTXFFST4TXFIFORESETSCIRSTTX F

14、IFO 形狀形狀 (read-only)00000TX FIFO 空空00001TX FIFO 有有 1 word00010TX FIFO 有有 2 words00011TX FIFO 有有 3 words10000TX FIFO 有有 16 words.TX FIFO 中斷級位中斷級位TXFFST4-0與與TXFFIL4-0匹配是產(chǎn)生中斷匹配是產(chǎn)生中斷SCI FIFO加強(qiáng)型功能使能位加強(qiáng)型功能使能位0 = disable1 = enableTX FIFO 復(fù)位復(fù)位0 = 復(fù)位后復(fù)位后FIFO 指針為指針為01 = 重新使能操作重新使能操作TX FIFO中斷使能中斷使能0 = 制止基于制止基于

15、TXFFIVL匹配的中斷匹配的中斷1 = 使能基于使能基于TXFFIVL匹配的中斷匹配的中斷TX FIFO中斷標(biāo)志位中斷標(biāo)志位 (read-only)0 = not occurred1 = occurredTX FIFO中斷標(biāo)志清零位中斷標(biāo)志清零位0 = no effect1 = clearSCI 復(fù)位復(fù)位0 = reset1 = enable operation0RXFFIL2RXFF-OVF CLRRXFFST0RXFFST3RXFFIEN123456789101112131415RXFFIL0RXFFIL1RXFFIL4 RXFFIL3RXFFST1RXFFINTCLRRXFFST2RX

16、FFINTRXFFST4RXFIFORESETRXFF-OVFRX FIFO 形狀形狀s (read-only)00000RX FIFO 空空00001RX FIFO 有有 1 word00010RX FIFO 有有 2 words00011RX FIFO 有有 3 words10000RX FIFO 有有 16 words.RX FIFO 中斷級位中斷級位RXFFST4-0與與 RXFFIL4-0 匹配是產(chǎn)生中斷匹配是產(chǎn)生中斷RX FIFO 復(fù)位復(fù)位0 = 復(fù)位后復(fù)位后FIFO 指針位指針位01 = 重新使能接納重新使能接納FIFO 的操作的操作RX FIFO中斷使能位中斷使能位0 = 制止

17、基于制止基于RXFFIVL匹配的中斷匹配的中斷1 = 使能基于使能基于RXFFIVL匹配的中斷匹配的中斷RX FIFO中斷標(biāo)志位中斷標(biāo)志位 (read-only)0 = not occurred1 = occurredRX FIFO中斷標(biāo)志清零位中斷標(biāo)志清零位0 = no effect1 = clearRX FIFO溢出標(biāo)志位溢出標(biāo)志位 (read-only)0 = no overflow1 = overflowRX FIFO溢出標(biāo)志清零位溢出標(biāo)志清零位0 = no effect1 = clear0ABDCLR123456789101112131415CDCABDFFTXDLY這些位規(guī)定了從這些位規(guī)定了從FIFO發(fā)送緩沖奇到發(fā)送移位存放器之間發(fā)送緩沖奇到發(fā)送移位存放器之間每一次傳送的延時每一次傳送的延時 確定確定 SCI 波特率時鐘周期的個數(shù)波特率時鐘周期的個數(shù)( 0 to 255 )CDC 校準(zhǔn)自動檢測位校準(zhǔn)自動檢測位0 = 制止自動檢測校準(zhǔn)制止自動檢測校準(zhǔn)1 = 使能自動檢測校準(zhǔn)使能自動檢測校準(zhǔn)自動波特率檢測自動波特率檢測標(biāo)志位標(biāo)志位 (read-only)0 = not complete1 = complete自動波特率檢測