Remote Frame, Data Field | National CP3BT26 specs

	A CAN data frame consists of the following fields:		Acknowledgment Field (ACK)
		Start of Frame (SOF)	End of Frame (EOF)

	Arbitration Field + Extended Arbitration		Remote Frame
	Control Field		Figure 38 shows the structure of a standard remote frame.
		Data Field
			Figure 39 shows the structure of an extended remote frame.
		Cyclic Redundancy Check Field (CRC)

STANDARD REMOTE FRAME (number of bits = 44)

						16
		Arbitration Field		Control Field		CRC Field	END OF
							FRAME
STARTFRAMEOF		11			4	15	ACKNOWLEDGEMENT ACK DEL
						CRC
	ID 10	ID3	ID0	RTR IDE RB0 DLC3	DLC0	CRCDEL
d				d d d		r	r r r r r r r r
		IDENTIFIER			DATA
		10 ... 0			DATA
		10 ... 0		LENGTH CODE
				LENGTH CODE
Note:
d = dominant							DS022
r	= recessive						DS022
r	= recessive

Figure 38. Standard Remote Frame

EXTENDED REMOTE FRAME (number of bits = 64)

FRAME							16
			Arbitration Field		Control Field		CRC Field	END OF
								FRAME
	11		18			4	15
START OF	11		18			4	15	SCK ACK DEL
							CRC
	ID 28	ID18	SRR IDE ID17	ID0	RTR RB1 RB0 DLC3	DLC0	CRCDEL
d			r r		r d d		r	r r r r r r r r
	IDENTIFIER		IDENTIFIER			DATA
	28 ... 18		IDENTIFIER			DATA
	28 ... 18		17 ... 0		LENGTH CODE
Note:			17 ... 0		LENGTH CODE
Note:
d = dominant
r = recessive								DS023

Figure 39. Extended Remote Frame

A remote frame is comprised of the following fields, which is the same as a data frame (see CAN Frame Fields on page 111) except for the data field, which is not present.

Start of Frame (SOF)

Arbitration Field + Extended Arbitration

Control Field

Cyclic Redundancy Check Field (CRC)

Acknowledgment field (ACK)

End of Frame (EOF)

Note that the DLC must have the same value as the corre- sponding data frame to prevent contention on the bus. The RTR bit is “recessive”.

CP3BT26

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Image 113

National CP3BT26 manual Remote Frame, Data Field, Cyclic Redundancy Check Field CRC

Contents

General Description Block DiagramMAY National Semiconductor Corporation Table of Contents Features Device Overview Can Interface Bluetooth LLCQuad Uart Advanced Audio Interface ACCESS.BUS Interface MICROWIRE/SPIMULTI-FUNCTION Timer Versatile Timer Unit DMA Controller Power ManagementSerial Debug Interface Development Support CP3BT26 Signal DescriptionsLQFP-128 LQFP-144 X1CKI ResetBbclk X1CKO Name Pins Primary Function Alternate Alternate Function Sdat PG4PG5 PG6 X1CKI WR0 SelioWR1 CTS PE4 SLE Dedicated Address Registers CPU ArchitectureGENERAL-PURPOSE Registers Interrupt Base Register Intbase Processor Status Register PSR12 11 Reserved No carry or borrow occurred Carry or borrow occurred When the IDT has 16-bit entries, and all ex Configuration Register CFGMode for the CR16B large model. Is held in the Intbase register, which is not Loadw 12R5, R6 Addressing ModesAddb R1, R2 Instruction SET Stacks Instruction Set Summary Mnemonic Operands Description Lshd AshudTbit LPR Push RetxPOP Popret Eiwait StormpNOP Wait IN/A MemoryOperating Environment BUS Cycles BUS Interface Unit BIUBIU Control Registers Empty Static Zone 0 Configuration Register SZCFG0 2 I/O Zone Configuration Register Iocfg WBR RBE Hold Wait Ipst Static Zone 1 Configuration Register SZCFG1Static Zone 2 Configuration Register SZCFG2 Wait and Hold States Access to PeripheralsFlash Program/Data Memory RAM Memory System Configuration Registers Name Address Description System Configuration RegistersModule Configuration Register Mcfg Module Status Register Mstat Software Reset Register Swreset Flash Memory Organization Flash MemoryFlash Memory Protection Flash Memory Operations Main Block Module Erase Main Block Page EraseInformation Block Module Erase Main Block Write Area BootInformation Block Words Boot Area Start-Up Operation CPU Reset BehaviorFlash Memory Interface Registers Empty Ispe Flash Memory 1 Write Enable Register FM1WER Flash Memory 0 Write Enable Register FM0WER/FSM0WERFlash 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 Channel Assignment DMA ControllerTransfer Types DMA Channel Assignment Peripheral Trans Register Action Operation Modes DMA Controller Register SET Debug ModeSoftware DMA Request Device a Address Register ADRAn Device a Address Counter Register ADCAnDevice B Address Counter Register ADCBn Device B Address Register ADRBn DMA Control Register DMACNTLn Block Length Register BLTRn VLD DMA Status Register DmastatVLD Chac OVR NON-MASKABLE Interrupts 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 2 IENAM2 Interrupt Enable and Mask Register 1 IENAM1Interrupt Status Register 1 ISTAT1 Interrupt Status Register 2 ISTAT2 Nested Interrupts Maskable Interrupt SourcesMaskable Interrupts Assignment IRQ Number Description IRQ Number Description Triple Clock and Reset Module Triple Clock and Reset Crystal Resonance Frequency External Crystal NetworkType Capacitor C1, C2 Capacitance Slow Clock Main ClockPLL Clock Min. Q factor External Reset POWER-ON ResetClock and Reset Registers System Clock MODE20 Active Mode Power ManagementPower Save Mode Module Activity Summary Power Mode Clock Halt Mode Idle Mode Power Management RegistersPower Management Registers Name Address Description Power Management Control Register Pmmcr Hcch DHCHccm OHC Active Mode to Power Save ModeOHC OMC OLC Entering Halt Mode Entering Idle ModeSoftware-Controlled Transition to Active Mode Wake-Up Transition to Active Mode Multi-Input Wake-Up Multi-Input Wake-Up Module Block Diagram Miwu Sources MULTI-INPUT WAKE-UP RegistersMiwu Channel Multi-Input Wake-Up Registers Name Address Description Wake-Up 1 Interrupt Enable Register WK1IENA Wake-Up Interrupt Enable Register WK0IENAWake-Up Enable Register WK0ENA Wake-Up 1 Edge Detection Register WK1EDG WK0ICTL1 WK0ICTL2 Wake-Up Interrupt Control RegisterWake-Up 1 Interrupt Control Register WK1ICTL1 WK1ICTL2 Wake-Up Pending Clear Register WK0PCL Wake-Up Pending Register WK0PNDWake-Up 1 Pending Register WK1PND Wake-Up 1 Pending Clear Register WK1PCL Programming Procedures Port Registers Input/Output Ports Address Description Port Registers Port Data Input Register PxDIN Port Alternate Function Register PxALTPort Data Output Register PxDOUT Port Direction Register PxDIR Port Alternate Function Select Register PxALTS Port High Drive Strength Register PxHDRVAlternate Function Select Port Pin PxALTS = OPEN-DRAIN Operation RF Interface Bluetooth ControllerX1CKI/BBCLK Rfdata Rfce Serial InterfaceSclk Sdat Serial Interface Write Timing Read Operation Write Operation First part of read cycle driven by CP3BT26. Address is 0Ah Bit, and register address for a read cycle. In the second 15.4 LMX5252 POWER-UP Sequence 15.3 LMX5251 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 ADC Clock Generation OperationADC Voltage References Pen-Down Detector Touchscreen Interface Touchscreen Driver Configuration RX2 Measuring Pen ForceRY2 RYP Freeze ADC Operation in POWER-SAVING ModesADC Register SET ADC Registers Name Address Description Touchcfg ADC0/TSX+ ADC1/TSY+ ADC2/TSX ADC3/TSY Muxcfg Clkdiv PrefcfgNrefcfg ADC Start Conversion Register Adcstart ADC Start Conversion Delay Register AdcscdlyADC Conversion Control Register Adccntrl Adcresult ADC Result Register AdcresltAdcoflw Sign Random Number Generator RNG RNG Module Block Diagram Random Number Generator Register SET Functional States USB Controller TX Fifo RX Fifo Endpoint Operation Transmit Endpoint Fifo Operation TXFIFO1, TXFIFO2, TXFIFO3 Bidirectional Control Endpoint FIFO0 Operation USB Controller Registers Name Address Description USB Controller RegistersReceive Endpoint Fifo Operation RXFIFO1, RXFIFO2, RXFIFO3 Main Control Register Mcntrl NFS Node Functional State Register NfsrUSB 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 Mask Register Dmamsk DMA Error Register DmaerrMirror 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 Tfwl Transmit Command Register n TXCnLast RFF Receive Status Register n RXSn Transmit Fifo Warning LimitTfwl Bytes Remaining in Fifo Transceiver Interface Receive Command Register n RXCn Receive Data Register n RXDReceive Fifo Warning Limit Rfwl Can Module Basic can Concepts Can Block Diagram Can Frame Fields Can Frame TypesStart of Frame SOF Arbitration Field Data Field Data Length Code DLCCyclic Redundancy Check CRC ACK Field Cyclic Redundancy Check Field CRC Remote FrameData Field Error Frame Overload Frame Error Frame Form Error Stuff ErrorBit CRC Error Acknowledgment Error Error Warning Error ActiveError Passive Error Counters Can Bit Time Bit Time LogicSynchronization Bit Timing CKI Message Transfer Example 1 Acceptance of a Single Identifier Acceptance FilteringTwo 32-bit masks are used to filter unwanted messages From the can bus Gmask and BMASK. shows 120 Receive Structure Receive Timing Receive ProcedureWriting to Buffer Status Code During Rxbusy 122 Buffer Read Routine Bufflock Enabled Transmit Priority Transmit StructureTransmit Scheduling PRI Txpri TX Buffer States Interrupts IRQ IST3 IST2 IST1 IST0 Time Stamp Counter Memory Organization CPU Access to can Registers/MemoryMessage 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 DLC Data Length CodingStorage of Standard Messages Standard Frame with 8 Data Bytes Address Buffer Register PRI SRR Extended Messages with 8 Data Bytes Address Buffer RegisterCnstat DLC Contents of these registers are ignored. If a remote Frame is received, the contents of these registers will beStorage of Remote Messages Extended Remote Frame Address Buffer Register Can Global Configuration Register Cgcr When the Ignore Acknowledge bit is set, Listen Only bit can be used to configureWhen the Loopback bit is set, all messages Dress, as shown in Figure SJW TSEG2 TSEG1RTR IDE Xrtr Basic Mask Register BMSKB/BMSKX Can Interrupt Enable Register CienBasic Mask BM2818 BM170 IRQ Can Error Diagnostic Register Cediag Can Error Counter Register CanecError Field Identifier EFID30 External can Pins Signal Name Type Description Can Timer Register CtmrSystem START-UP and MULTI-INPUT WAKE-UP External Connection Bit Time Logic Calculation Examples Minimum Clock Frequency Requirements Baud RateAcceptance Filter Considerations Remote Frames Usage Hint Audio Interface Modes Audio Interface SignalsAdvanced Audio Interface DMA Support Synchronous ModeNormal Mode 145 Frame Clock Generation Clock ConfigurationBIT Clock Generation Audio Interface Operation DMA Operation TransmitFifo Operation Receive Data Word Length Frame Sync SignalCommunication Options Short and Long Frame Sync Pulses Audio Control Data 150 IOM-2 ModeLoopback Mode Audio Interface Registers Name Address Description Freeze ModeAudio Interface Registers Audio Transmit Fifo Register Atfr Audio Receive Fifo Register ArfrAudio Receive DMA Register n ARDRn Audio Transmit DMA Register n ATDRn Slots per Mode Frame Audio Global Configuration Register AgcrSCS FSL Txeip Txip Rxeip Rxip Txeie Txie Rxeie Rxie Audio Interrupt Status and Control Register AiscrTxeic 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 DMA Control Register Admacr Audio Clock Control Register AccrRMD DMA Request Condition PCM Conversions CVSD/PCM Conversion ModuleOperation PCM to Cvsd Conversion Cvsd ConversionCvsd to PCM Conversion Interrupt Generation CVSD/PCM Converter Registers Linearout Cvsd Status Register Cvstat Uart Operation Uart ModulesFunctional Overview Uart Asynchronous Communication Uart Block Diagram Frame Format Selection Diagnostic Mode Prescaler Factor Prescaler Factors Parity Generation and Detection Break Generation and Detection Uart Registers Name Address Description Uart Registers Uart Receive Data Buffer UnRBUF Uart Baud Rate Divisor UnBAUDUart Transmit Data Buffer UnTBUF Uart Frame Select Register UnFRS Uart Status Register UnSTAT Uart Mode Select Register 1 UnMDSL1 Uart Oversample Rate Register UnOVR Uart Interrupt Control Register UnICTRLUOVSR30 Oversampling Rate Baud Rate Calculations Uart Mode Select Register 2 UnMDSL2Uart Sample Position Register UnSPOS Oversampling Rate Sample Position 173 174 Microwire Operation Microwire/SPI InterfaceMicrowire Interface Shifting Clocking Modes Writing Normal Mode Scidl = Master Mode MWCTRL1 Slave ModeMicrowire Interrupt Trigger Condition Status Enable Bit Mwen Microwire Interface Registers SCM Microwire Status Register MwstatScdv OVR RBF BSY ACB Protocol Overview ACCESS.bus InterfaceData Transactions Start and Stop Arbitration on the Bus Acknowledge CycleAddressing Transfer Formats ACB Functional Description Bus Idle Error Recovery Master Error DetectionsSlave Mode Slave Error Detections ACCESS.BUS Interface Registers ACB Control Status Register Acbcst ACB Control Register 1 ACBCTL1 TgsclStart Stop ACB Control Register 3 ACBCTL3 ACB Control Register 2 ACBCTL2 ACB Own Address Register 1 ACBADDR1 Usage HintsSaen Addr Saen 190 Avoiding Bus Error During Write Transaction 191 TWM Structure Timer T0 OperationTiming and Watchdog Module Watchdog Operation Power Save Mode OperationTWM Registers Register Locking T0IN Mdiv Watchdog Service Data Match Register Wdsdm Watchdog Programming ProcedureTWMT0 Control and Status Register T0CSR Watchdog Count Register Wdcnt Timer Structure Multi-Function TimerClock Source Block 196 Pulse Accumulate Mode Timer Operating ModesLimitations in Low-Power Modes Counter Clock Source Select 198 Mode 1 Processor-Independent PWM Dual-Input Capture Mode Mode 2 Dual Input Capture 200 Mode 3 Dual Independent Timer/Counter Input Capture Plus Timer Mode Mode 4 Input Capture Plus Timer Timer I/O Functions Timer InterruptsTaen Tben Timer Registers Reload/Capture B Register Tcrb Timer Mode Control Register TctrlReload/Capture a Register Tcra Timer Interrupt Clear Register Ticlr Timer Interrupt Control Register Tictl 206 Versatile Timer Unit VTUVTU Functional Description VTU PWM Generation Dual 8-bit PWM Mode 208 VTU 16-bit PWM Mode Dual 16-Bit Capture Mode ISE Mode operation VTU Dual 16-bit Capture Mode Low Power Mode VTU Registers Name Address Description Mode Control Register ModeVTU Registers Interrupt Control Register Intctl CxEDG Capture Counter Reset Clock Prescaler Register 2 CLK2PS Clock Prescaler Register 1 CLK1PSInterrupt Pending Register Intpnd CNTx Counter Register n COUNTxDuty Cycle/Capture Register n DTYCAPx Period/Capture Register n PERCAPx Register Map Bluetooth LLC Registers USB Node Registers Register Name Size Address Access Value After Comments Type TXC1 EPC1EPC2 EPC4 Can Module Message Buffers DMA Controller Can Registers Bus Interface Unit Flash Data Memory Interface System ConfigurationFlash Program Memory Interface CVSD/PCM Converter Triple Clock + Reset General-Purpose I/O Ports Multi-Input Wake-Up Comments Type Register Name Size Address Interrupt Control Unit Advanced Audio Interface UART1 UART0 UART3 UART2 Timing and Watchdog ACCESS.busMulti-Function Timer ADC Versatile Timer Unit Rngcst RNGRngd Word FF F284h Register Bit Fields USB IGN Ignout Rxen Setup EPC1 Setup Toggle Rxlast Rcount RXC0Nakev OUT Nakmsk Fwev RXWARN31 Fwmsk RXWARN31 Control Status Can Dmac Memory Registers BIU System Configuration RegistersTBI Register Flash Flash Data Memory CLK3RES CVSD/PCM MIWU16 PMM RegisterGpio Registers AAI Uart ICU Registers MFT16 MWSPI16ACB Registers VTU Imsk RngcstRngd Rngdivh Symbol Parameter Conditions Min Max Units Electrical CharacteristicsAbsolute Maximum Ratings TBD IOOff INL Symbol Parameter Conditions Min Typ Max UnitsLSB DNL Flash Memory ON-CHIP Programming Clock and Reset Timing Output Signal LevelsReset and NMI Input Signals TRI-STATE Clock Timing NMI Signal Timing Uart Timing Uart Output Signals 30.9 I/O Port Timing Port Output Signals Advanced Audio Interface AAI Timing AAI Output Signals Receive Timing, Long Frame Sync Transmit Timing, Short Frame Sync Microwire/SPI Signals Symbol Description Reference Min ns MICROWIRE/SPI TimingMicrowire/SPI Input Signals Microwire/SPI Output Signals Microwire Data Out Valid Normal Mode After FE onAlternate Mode After RE On MSK Propagation Time 254 255 256 Microwire Transaction Timing, Alternate Mode, Scidl = 257 ACCESS.bus Output Signals ACCESS.BUS Timing 259 260 ACB Data Timing MULTI-FUNCTION Timer MFT Timing USB Port AC Characteristics TIOx Input High Time Rising Edge RE on CLK Versatile Timing Unit VTU TimingTIOx Input Low Time RE on CLK 262 External BUS Timing External Bus Output Signals 264 Early Write Between Normal Read Cycles No Wait States 265 266 Consecutive Normal Read Cycles Burst, No Wait States 267 268 Early Write Between Fast Read Cycles LQFP-128 Package Pin AssignmentsPWR X1CKO X1CKI Avcc PWR Adgnd Advcc Uvcc Reset TMSX2CKI X2CKO ENV2 SDA ADC0 TSX+ SRFS/NMI PE0 RXD0 Gpio PE1 TXD0 PE2 RTS PE3 CTS PE4 CKX/TB PE5PF0 MSK/TIO1 PF1 MDIDO/TIO2 272 LQFP-144 Package ADC4 MUXOUT0 SCL SDA ADC0 TSX+ADC5 MUXOUT1 ADC7 Adcin Pin Name Alternate Functions Pin Number Type A12 A22 A21 A20 A19 A18 A17 A16 A15 A14 A13A11 A10 Date Major Changes From Previous Version Revision HistoryRevision History LQFP-128 Package LQFP-144 Package Physical Dimensions millimeters unless otherwise noted Banned Substance Compliance Form when properly used in accordance with instructionsLife Support Policy