Uart Block Diagram | National CP3BT26 guide

CP3BT26

Data bits are sensed by taking a majority vote of three sam- ples latched near the midpoint of each baud (bit time). Nor- mally, the position of the samples within the baud is determined automatically, but software can override the au- tomatic selection by setting the USMD bit in the UnMDSL2 register and programming the UnSPOS register.

Serial data input on the RXD pin is shifted into the RSFT register. On receiving the complete character, the contents

of the RSFT register are copied into the UnRBUF register and the Receive Buffer Full bit (URBF) is set. The URBF bit is automatically cleared when software reads the character from the URBUF register. The RSFT register is not software accessible.

Internal Bus

Control and

Error Detection

Parity

Generator/Checker

Transmitter

Baud Clock

System Clock

Baud Rate

Generator

Baud Clock

Receiver

Flow Control

Logic

TXD

RTS

CTS

CKX

RXD

DS060

Figure 76. UART Block Diagram

	16	1		2		3		4				5	6		7		8		9		10		11		12		13		14		15		16		1
			Sample					STARTBIT												Sample														DATA (LSB)




	16		1		2		3		4			5		6		7		8		9		10		11		12		13		14		15		16		1

								DATABIT												Sample



																																			DS061

Figure 77. UART Asynchronous Communication

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National CP3BT26 manual Uart Block Diagram, Uart Asynchronous Communication

Contents

Block Diagram General DescriptionMAY National Semiconductor Corporation Table of Contents Features Device Overview Bluetooth LLC Can InterfaceQuad Uart Advanced Audio Interface MICROWIRE/SPI ACCESS.BUS InterfaceMULTI-FUNCTION Timer Versatile Timer Unit Power Management DMA ControllerSerial Debug Interface Development Support Signal Descriptions CP3BT26LQFP-128 LQFP-144 Reset X1CKIBbclk X1CKO Name Pins Primary Function Alternate Alternate Function PG4 SdatPG5 PG6 X1CKI Selio WR0WR1 CTS PE4 SLE Dedicated Address Registers CPU ArchitectureGENERAL-PURPOSE Registers Processor Status Register PSR Interrupt Base Register Intbase12 11 Reserved No carry or borrow occurred Carry or borrow occurred Configuration Register CFG When the IDT has 16-bit entries, and all exMode for the CR16B large model. Is held in the Intbase register, which is not Loadw 12R5, R6 Addressing ModesAddb R1, R2 Stacks Instruction SET Instruction Set Summary Mnemonic Operands Description Ashud LshdTbit LPR Retx PushPOP Popret Stormp EiwaitNOP Wait IN/A MemoryOperating Environment BUS Interface Unit BIU BUS CyclesBIU Control Registers Empty 2 I/O Zone Configuration Register Iocfg Static Zone 0 Configuration Register SZCFG0 WBR RBE Hold Wait Ipst Static Zone 1 Configuration Register SZCFG1Static Zone 2 Configuration Register SZCFG2 Access to Peripherals Wait and Hold StatesFlash Program/Data Memory RAM Memory System Configuration Registers Name Address Description System Configuration RegistersModule Configuration Register Mcfg Software Reset Register Swreset Module Status Register Mstat Flash Memory Organization Flash MemoryFlash Memory Protection Flash Memory Operations Main Block Page Erase Main Block Module EraseInformation Block Module Erase Main Block Write Area BootInformation Block Words CPU Reset Behavior Boot Area Start-Up OperationFlash Memory Interface Registers Empty Ispe Flash Memory 0 Write Enable Register FM0WER/FSM0WER Flash Memory 1 Write Enable Register FM1WERFlash Memory Information Block Data Register FMIBDR/FSMIBDR Fsmctrl Flash Data Memory 0 Write Enable Register FSM0WERFlash Memory Control Register Fmctrl FMSTART/FSMSTART FsmstatFsmpsr Flash Memory End Time Reload Register FMEND/FSMEND Flash Memory Auto-Read Register 2 FMAR2/ FSMAR2 FMRCV/FSMRCV FSMAR1Flash Memory Auto-Read Register 0 FMAR0/ FSMAR0 DMA Controller Channel AssignmentTransfer Types DMA Channel Assignment Peripheral Trans Register Action Operation Modes DMA Controller Register SET Debug ModeSoftware DMA Request Device a Address Counter Register ADCAn Device a Address Register ADRAnDevice B Address Counter Register ADCBn Device B Address Register ADRBn Block Length Register BLTRn DMA Control Register DMACNTLn VLD DMA Status Register DmastatVLD Chac OVR Interrupts NON-MASKABLE InterruptsMaskable Interrupts Interrupt Controller Registers Non-Maskable Interrupt Status Register Nmistat Interrupt Vector Register IvctExternal NMI Trap Control and Status Register Exnmi Interrupt Enable and Mask Register 1 IENAM1 Interrupt Enable and Mask Register 2 IENAM2Interrupt Status Register 1 ISTAT1 Interrupt Status Register 2 ISTAT2 Maskable Interrupt Sources Nested InterruptsMaskable Interrupts Assignment IRQ Number Description IRQ Number Description Triple Clock and Reset Triple Clock and Reset Module External Crystal Network Crystal Resonance FrequencyType Capacitor C1, C2 Capacitance Main Clock Slow ClockPLL Clock Min. Q factor POWER-ON Reset External ResetClock and Reset Registers System Clock MODE20 Power Management Active ModePower Save Mode Module Activity Summary Power Mode Clock Idle Mode Power Management Registers Halt ModePower Management Registers Name Address Description Power Management Control Register Pmmcr Hcch DHCHccm OHC Active Mode to Power Save ModeOHC OMC OLC Entering Idle Mode Entering Halt ModeSoftware-Controlled Transition to Active Mode Wake-Up Transition to Active Mode Multi-Input Wake-Up Module Block Diagram Multi-Input Wake-Up MULTI-INPUT WAKE-UP Registers Miwu SourcesMiwu Channel Multi-Input Wake-Up Registers Name Address Description Wake-Up Interrupt Enable Register WK0IENA Wake-Up 1 Interrupt Enable Register WK1IENAWake-Up Enable Register WK0ENA Wake-Up 1 Edge Detection Register WK1EDG Wake-Up Interrupt Control Register WK0ICTL1 WK0ICTL2Wake-Up 1 Interrupt Control Register WK1ICTL1 WK1ICTL2 Wake-Up Pending Register WK0PND Wake-Up Pending Clear Register WK0PCLWake-Up 1 Pending Register WK1PND Wake-Up 1 Pending Clear Register WK1PCL Programming Procedures Input/Output Ports Port Registers Port Registers Address Description Port Alternate Function Register PxALT Port Data Input Register PxDINPort Data Output Register PxDOUT Port Direction Register PxDIR Port High Drive Strength Register PxHDRV Port Alternate Function Select Register PxALTSAlternate Function Select Port Pin PxALTS = OPEN-DRAIN Operation Bluetooth Controller RF InterfaceX1CKI/BBCLK Rfdata Serial Interface RfceSclk Sdat Write Operation Serial Interface Write Timing Read Operation Bit, and register address for a read cycle. In the second First part of read cycle driven by CP3BT26. Address is 0Ah 15.3 LMX5251 POWER-UP Sequence 15.4 LMX5252 POWER-UP Sequence Bluetooth Sequencer RAM Bluetooth Sleep ModeBluetooth Global Registers Bluetooth Shared Data RAM Data Path 16.0 12-Bit Analog to Digital ConverterFunctional Description Operation ADC Clock GenerationADC Voltage References Pen-Down Detector Touchscreen Driver Configuration Touchscreen Interface Measuring Pen Force RX2RY2 RYP ADC Operation in POWER-SAVING Modes FreezeADC Register SET ADC Registers Name Address Description Muxcfg Touchcfg ADC0/TSX+ ADC1/TSY+ ADC2/TSX ADC3/TSY Clkdiv PrefcfgNrefcfg ADC Start Conversion Register Adcstart ADC Start Conversion Delay Register AdcscdlyADC Conversion Control Register Adccntrl ADC Result Register Adcreslt AdcresultAdcoflw Sign RNG Module Block Diagram Random Number Generator RNG Random Number Generator Register SET USB Controller Functional States Endpoint Operation TX Fifo RX Fifo Bidirectional Control Endpoint FIFO0 Operation Transmit Endpoint Fifo Operation TXFIFO1, TXFIFO2, TXFIFO3 USB Controller Registers Name Address Description USB Controller RegistersReceive Endpoint Fifo Operation RXFIFO1, RXFIFO2, RXFIFO3 Main Control Register Mcntrl Node Functional State Register Nfsr NFSUSB Functional States NFS Alternate Event Register Altev Main Event Register MaevMain Mask Register Mamsk Transmit Mask Register Txmsk Alternate Mask Register AltmskTransmit Event Register Txev NAK Mask Register Nakmsk Receive Event Register Rxev NAK Event Register NakevReceive Mask Register Rxmsk Fifo Warning Mask Register Fwmsk Fifo Warning Event Register FwevFrame Number High Byte Register FNH Dsrc DMA Event Register Dmaev DMA Error Register Dmaerr DMA Mask Register DmamskMirror Register MIR DMA Count Register Dmacnt Transmit Status 0 Register TXS0 Transmit Command 0 Register TXC0Endpoint Control 0 Register EPC0 Receive Status 0 Register RXS0 Receive Command 0 Register RXC0Transmit Data 0 Register TXD0 Transmit Status Register n TXSn Receive Data 0 Register RXD0Endpoint Control Register n EPCn Transmit Command Register n TXCn TfwlLast RFF Transmit Fifo Warning Limit Receive Status Register n RXSnTfwl Bytes Remaining in Fifo Receive Command Register n RXCn Receive Data Register n RXD Transceiver InterfaceReceive Fifo Warning Limit Rfwl Can Module Can Block Diagram Basic can Concepts Can Frame Types Can Frame FieldsStart of Frame SOF Arbitration Field Data Length Code DLC Data FieldCyclic Redundancy Check CRC ACK Field Cyclic Redundancy Check Field CRC Remote FrameData Field Error Frame Error Frame Overload Frame Stuff Error Form ErrorBit CRC Error Acknowledgment Error Error Active Error WarningError Passive Error Counters Bit Time Logic Can Bit TimeSynchronization Bit Timing Message Transfer CKI Acceptance Filtering Example 1 Acceptance of a Single IdentifierTwo 32-bit masks are used to filter unwanted messages From the can bus Gmask and BMASK. shows Receive Structure 120 Receive Procedure Receive TimingWriting to Buffer Status Code During Rxbusy Buffer Read Routine Bufflock Enabled 122 Transmit Priority Transmit StructureTransmit Scheduling Txpri PRI Interrupts TX Buffer States Time Stamp Counter IRQ IST3 IST2 IST1 IST0 CPU Access to can Registers/Memory Memory OrganizationMessage Buffer Organization Message Buffer Map Address Register Buffer Status/Control Register Cnstat Can Controller RegistersCan Controller Registers Name Address Description Buffer Status Buffer Status Section of the Cnstat RegisterST3 DIR ST2 ST1 ST0 Busy Data Length Coding DLCStorage of Standard Messages Standard Frame with 8 Data Bytes Address Buffer Register PRI SRR Extended Messages with 8 Data Bytes Address Buffer RegisterCnstat DLC Frame is received, the contents of these registers will be Contents of these registers are ignored. If a remoteStorage of Remote Messages Extended Remote Frame Address Buffer Register Can Global Configuration Register Cgcr Listen Only bit can be used to configure When the Ignore Acknowledge bit is set,When the Loopback bit is set, all messages Dress, as shown in Figure SJW TSEG1 TSEG2RTR IDE Xrtr Can Interrupt Enable Register Cien Basic Mask Register BMSKB/BMSKXBasic Mask BM2818 BM170 IRQ Can Error Counter Register Canec Can Error Diagnostic Register CediagError Field Identifier EFID30 Can Timer Register Ctmr External can Pins Signal Name Type DescriptionSystem START-UP and MULTI-INPUT WAKE-UP External Connection Minimum Clock Frequency Requirements Baud Rate Bit Time Logic Calculation ExamplesAcceptance Filter Considerations Remote Frames Usage Hint Audio Interface Modes Audio Interface SignalsAdvanced Audio Interface DMA Support Synchronous ModeNormal Mode 145 Clock Configuration Frame Clock GenerationBIT Clock Generation Audio Interface Operation Transmit DMA OperationFifo Operation Receive Data Word Length Frame Sync SignalCommunication Options Audio Control Data Short and Long Frame Sync Pulses 150 IOM-2 ModeLoopback Mode Audio Interface Registers Name Address Description Freeze ModeAudio Interface Registers Audio Receive Fifo Register Arfr Audio Transmit Fifo Register AtfrAudio Receive DMA Register n ARDRn Audio Transmit DMA Register n ATDRn Audio Global Configuration Register Agcr Slots per Mode FrameSCS FSL Audio Interrupt Status and Control Register Aiscr Txeip Txip Rxeip Rxip Txeie Txie Rxeie RxieTxeic Txic Rxeic Rxic Rxie Txeip Audio Receive Status and Control Register Arscr Rxsa Bit Slots EnabledRxdsa Bit Slots Enabled For DMA Audio Transmit Status and Control Register Atscr Txsa Bit Slots EnabledTxdsa Bit Slots Enabled For DMA Audio Clock Control Register Accr Audio DMA Control Register AdmacrRMD DMA Request Condition PCM Conversions CVSD/PCM Conversion ModuleOperation Cvsd Conversion PCM to Cvsd ConversionCvsd to PCM Conversion Interrupt Generation CVSD/PCM Converter Registers Linearout Cvsd Status Register Cvstat Uart Operation Uart ModulesFunctional Overview Uart Block Diagram Uart Asynchronous Communication Diagnostic Mode Frame Format Selection Prescaler Factors Prescaler Factor Break Generation and Detection Parity Generation and Detection Uart Registers Uart Registers Name Address Description Uart Baud Rate Divisor UnBAUD Uart Receive Data Buffer UnRBUFUart Transmit Data Buffer UnTBUF Uart Frame Select Register UnFRS Uart Mode Select Register 1 UnMDSL1 Uart Status Register UnSTAT Uart Interrupt Control Register UnICTRL Uart Oversample Rate Register UnOVRUOVSR30 Oversampling Rate Uart Mode Select Register 2 UnMDSL2 Baud Rate CalculationsUart Sample Position Register UnSPOS Oversampling Rate Sample Position 173 174 Microwire/SPI Interface Microwire OperationMicrowire Interface Shifting Writing Clocking Modes Master Mode Normal Mode Scidl = MWCTRL1 Slave ModeMicrowire Interrupt Trigger Condition Status Enable Bit Microwire Interface Registers Mwen Microwire Status Register Mwstat SCMScdv OVR RBF BSY ACCESS.bus Interface ACB Protocol OverviewData Transactions Start and Stop Arbitration on the Bus Acknowledge CycleAddressing Transfer Formats ACB Functional Description Master Error Detections Bus Idle Error RecoverySlave Mode Slave Error Detections ACCESS.BUS Interface Registers ACB Control Status Register Acbcst Tgscl ACB Control Register 1 ACBCTL1Start Stop ACB Control Register 2 ACBCTL2 ACB Control Register 3 ACBCTL3 Usage Hints ACB Own Address Register 1 ACBADDR1Saen Addr Saen Avoiding Bus Error During Write Transaction 190 191 TWM Structure Timer T0 OperationTiming and Watchdog Module Power Save Mode Operation Watchdog OperationTWM Registers Register Locking Mdiv T0IN Watchdog Programming Procedure Watchdog Service Data Match Register WdsdmTWMT0 Control and Status Register T0CSR Watchdog Count Register Wdcnt Multi-Function Timer Timer StructureClock Source Block 196 Timer Operating Modes Pulse Accumulate ModeLimitations in Low-Power Modes Counter Clock Source Select Mode 1 Processor-Independent PWM 198 Mode 2 Dual Input Capture Dual-Input Capture Mode Mode 3 Dual Independent Timer/Counter 200 Mode 4 Input Capture Plus Timer Input Capture Plus Timer Mode Timer Interrupts Timer I/O FunctionsTaen Tben Timer Registers Reload/Capture B Register Tcrb Timer Mode Control Register TctrlReload/Capture a Register Tcra Timer Interrupt Control Register Tictl Timer Interrupt Clear Register Ticlr 206 Versatile Timer Unit VTUVTU Functional Description Dual 8-bit PWM Mode VTU PWM Generation VTU 16-bit PWM Mode Dual 16-Bit Capture Mode 208 VTU Dual 16-bit Capture Mode Low Power Mode ISE Mode operation VTU Registers Name Address Description Mode Control Register ModeVTU Registers CxEDG Capture Counter Reset Interrupt Control Register Intctl Clock Prescaler Register 2 CLK2PS Clock Prescaler Register 1 CLK1PSInterrupt Pending Register Intpnd Counter Register n COUNTx CNTxDuty Cycle/Capture Register n DTYCAPx Period/Capture Register n PERCAPx Bluetooth LLC Registers Register Map Register Name Size Address Access Value After Comments Type USB Node Registers EPC1 TXC1EPC2 EPC4 Can Module Message Buffers Can Registers DMA Controller Bus Interface Unit Flash Data Memory Interface System ConfigurationFlash Program Memory Interface Triple Clock + Reset CVSD/PCM Converter Multi-Input Wake-Up General-Purpose I/O Ports Register Name Size Address Comments Type Advanced Audio Interface Interrupt Control Unit UART0 UART1 UART2 UART3 Timing and Watchdog ACCESS.busMulti-Function Timer Versatile Timer Unit ADC RNG RngcstRngd Word FF F284h Register Bit Fields USB Setup Toggle Rxlast Rcount RXC0 IGN Ignout Rxen Setup EPC1Nakev OUT Nakmsk Fwev RXWARN31 Fwmsk RXWARN31 Can Control Status Memory Registers Dmac System Configuration Registers BIUTBI Register Flash Flash Data Memory CVSD/PCM CLK3RES PMM Register MIWU16Gpio Registers AAI ICU Registers Uart MFT16 MWSPI16ACB Registers VTU Rngcst ImskRngd Rngdivh Electrical Characteristics Symbol Parameter Conditions Min Max UnitsAbsolute Maximum Ratings TBD IOOff Symbol Parameter Conditions Min Typ Max Units INLLSB DNL Flash Memory ON-CHIP Programming Output Signal Levels Clock and Reset TimingReset and NMI Input Signals TRI-STATE NMI Signal Timing Clock Timing Uart Output Signals Uart Timing Port Output Signals 30.9 I/O Port Timing AAI Output Signals Advanced Audio Interface AAI Timing Transmit Timing, Short Frame Sync Receive Timing, Long Frame Sync MICROWIRE/SPI Timing Microwire/SPI Signals Symbol Description Reference Min nsMicrowire/SPI Input Signals Microwire/SPI Output Signals Normal Mode After FE on Microwire Data Out ValidAlternate Mode After RE On MSK Propagation Time 254 255 Microwire Transaction Timing, Alternate Mode, Scidl = 256 257 ACCESS.BUS Timing ACCESS.bus Output Signals 259 ACB Data Timing 260 USB Port AC Characteristics MULTI-FUNCTION Timer MFT Timing Versatile Timing Unit VTU Timing TIOx Input High Time Rising Edge RE on CLKTIOx Input Low Time RE on CLK 262 External Bus Output Signals External BUS Timing Early Write Between Normal Read Cycles No Wait States 264 265 Consecutive Normal Read Cycles Burst, No Wait States 266 267 Early Write Between Fast Read Cycles 268 Pin Assignments LQFP-128 PackagePWR X1CKO X1CKI Reset TMS Avcc PWR Adgnd Advcc UvccX2CKI X2CKO ENV2 SDA ADC0 TSX+ PE0 RXD0 Gpio PE1 TXD0 PE2 RTS PE3 CTS PE4 CKX/TB PE5 SRFS/NMIPF0 MSK/TIO1 PF1 MDIDO/TIO2 LQFP-144 Package 272 SCL SDA ADC0 TSX+ ADC4 MUXOUT0ADC5 MUXOUT1 ADC7 Adcin Pin Name Alternate Functions Pin Number Type A22 A21 A20 A19 A18 A17 A16 A15 A14 A13 A12A11 A10 Date Major Changes From Previous Version Revision HistoryRevision History Physical Dimensions millimeters unless otherwise noted LQFP-128 Package LQFP-144 Package Banned Substance Compliance Form when properly used in accordance with instructionsLife Support Policy