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Texas Instruments TMS320F28016, TMS320F2809, TMS320F2808, TMS320C2802 Loss of Input Clock

Models: TMS320F28016 TMS320F2801 TMS320F2802 TMS320F28015 TMS320C2801 TMS320F2806 TMS320F2808 TMS320F2809 TMS320C2802

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TMS320F2809, TMS320F2808, TMS320F2806

TMS320F2802, TMS320F2801, TMS320C2802

TMS320C2801, TMS320F28016, TMS320F28015

SPRS230L –OCTOBER 2003 –REVISED DECEMBER 2009

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3.6.1.3Loss of Input Clock

In PLL-enabled and PLL-bypass mode, if the input clock OSCCLK is removed or absent, the PLL will still issue a limp-mode clock. The limp-mode clock continues to clock the CPU and peripherals at a typical frequency of 1-5 MHz. Limp mode is not specified to work from power-up, only after input clocks have been present initially. In PLL bypass mode, the limp mode clock from the PLL is automatically routed to the CPU if the input clock is removed or absent.

Normally, when the input clocks are present, the watchdog counter decrements to initiate a watchdog reset or WDINT interrupt. However, when the external input clock fails, the watchdog counter stops decrementing (i.e., the watchdog counter does not change with the limp-mode clock). In addition to this, the device will be reset and the “Missing Clock Status” (MCLKSTS) bit will be set. These conditions could be used by the application firmware to detect the input clock failure and initiate necessary shut-down procedure for the system.

NOTE

Applications in which the correct CPU operating frequency is absolutely critical should implement a mechanism by which the DSP will be held in reset, should the input clocks ever fail. For example, an R-C circuit may be used to trigger the XRS pin of the DSP, should the capacitor ever get fully charged. An I/O pin may be used to discharge the capacitor on a periodic basis to prevent it from getting fully charged. Such a circuit would also help in detecting failure of the flash memory and the VDD3VFL rail.

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Functional Overview

Copyright © 2003–2009, Texas Instruments Incorporated

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Product Folder Link(s): TMS320F2809 TMS320F2808 TMS320F2806 TMS320F2802 TMS320F2801 TMS320C2802

TMS320C2801 TMS320F28016 TMS320F28015

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Texas Instruments TMS320F28016, TMS320F2809, TMS320F2808, TMS320C2802, TMS320C2801, TMS320F2806 Loss of Input Clock

Contents

Data Manual ROM Gpio MUX ROM Timing C280x only Typical Operational Power Versus Frequency F2808 Warm Reset TMS320F2809, TMS320F2808, TMS320F2806 Xclkin Timing Requirements PLL Enabled Features Check for Download starter software Getting StartedAcquire the appropriate development tools Download flash programming software Introduction Hardware Features 100-MHz Devices Feature TYPE1 Hardware Features 60-MHz Devices Feature Pin Assignments TMS320F2809, TMS320F2808 100-Pin PZ Lqfp Top View TMS320F2806 100-Pin PZ Lqfp Top View On the C280x devices, the VDD3VFL pin is Vddio TMS320F2801x 100-Pin PZ Lqfp Top View Bottom View Signal Descriptions Signal Descriptions CPU and I/O Power Pins ResetADC Signals Gpioa and Peripheral Signals 2 Signal Descriptions TMS320F2809, TMS320F2808, TMS320F2806 TMS320C2801, TMS320F28016, TMS320F28015 GPIO33 Functional Block Diagram Protected by the CODE-SECURITY Module Memory Maps F2809 Memory Map F2808 Memory Map F2806 Memory Map F2802, C2802 Memory Map F2801, F28015, F28016, C2801 Memory Map Addresses of Flash Sectors in F2806, F2802 Addresses of Flash Sectors in F2809Addresses of Flash Sectors in F2808 Address Range Program and Data Space Address Flash ROM Impact of Using the Code Security ModuleAddresses of Flash Sectors in F2801, F28015, F28016 OTP Wait-statesArea WAIT-STATES Comments H0 Saram Memory Bus Harvard Bus Architecture Brief Descriptions1 C28x CPU Peripheral Bus 6 ROM Real-Time Jtag and AnalysisFlash 7 M0, M1 SARAMs 8 L0, L1, H0 SARAMs Boot ROMBoot Mode Selection Security Disclaimer Code Security Module Disclaimer External Interrupts XINT1, XINT2, Xnmi Low-Power ModesPeripheral Interrupt Expansion PIE Block Oscillator and PLL General-Purpose Input/Output Gpio Multiplexer 19 32-Bit CPU-Timers 0, 1Peripheral Frames 0, 1, 2 PFn Control Peripherals Serial Port Peripherals Register Map Peripheral Frame 1 Registers1 Access TypePeripheral Frame 0 Registers1 Name Address Range 10. Peripheral Frame 2 Registers1 Device Emulation RegistersInterrupts 11. Device Emulation Registers External and PIE Interrupt Sources Intm INT1 INT2 INT11 INT12MUX 14. External Interrupt Registers 13. PIE Configuration and Control RegistersExternal Interrupts System Control 15. PLL, Clocking, Watchdog, and Low-Power Mode Registers1 OSC and PLL Block External Clock Signal Toggling 0 −V DD Crystal PLL-Based Clock Module 17. Possible PLL Configuration ModesPLL Mode Remarks Pllstsclkindiv Sysclkout Clkin 16. Pllcr Register Bit Definitions Loss of Input Clock Watchdog Block LPMCR010 Low-Power Modes Block18. Low-Power Modes Oscclk Clkin Sysclkout Prdhprd 32-Bit CPU-Timers 0/1/2Tddrhtddr Pschpsc TCR.4 CPU-Timers 0, 1, 2 Configuration and Control Registers Enhanced PWM Modules ePWM1/2/3/4/5/6 #SHADOW EPWM Control and Status RegistersEPWM1 EPWM2 EPWM3 EPWM4 EPWM5 EPWM6 Size CTR = Zero Hi-Resolution PWM Hrpwm Enhanced CAP Modules eCAP1/2/3/4 RST CtrphsCtrovf OVF CTR=PRD CTR=CMP Size Description ECAP Control and Status RegistersECAP1 ECAP2 ECAP3 ECAP4 Enhanced QEP Modules eQEP1/2 Register Description EQEP Control and Status RegistersEQEP1 EQEP2 Address #SHADOW Enhanced Analog-to-Digital Converter ADC Module ADCINA7 Sysclkout DSP Adcenclk Halt HspclkADCINA0 ADCINB0 ADCINB7 Adclo ADCINA70ADCINB70 Adcrefin ADC Connections if the ADC Is Not Used Adcresext ADC Registers ADC Registers1 Peripherals SN65HVD23x TMS320F2809, TMS320F2808, TMS320F2806TMS320F2802, TMS320F2801, TMS320C2802 Can Bus 11. eCAN-A Memory Map 12. eCAN-B Memory Map ECAN-A ECAN-B Can Register Map1Register Name Size Description Address Serial Communications Interface SCI Modules SCI-A, SCI-B SCI-A Registers1 SCI-B Registers1 13. Serial Communications Interface SCI Module Block Diagram When Spibrr = 3 to 10. SPI-A Registers 11. SPI-B Registers 12. SPI-C Registers 13. SPI-D Registers 14. SPI Module Block Diagram Slave Mode −−−−− Inter-Integrated Circuit I2C I2CAENCLK I2C−A C28X CPU Sysclkout 14. I2C-A RegistersGpio MUX Sdaa Scla Sysrs Gpiolmpsel GPIOXINT1SEL GPIOXINT2SEL Gpioxnmisel Gpio Data Registers not Eallow Protected 15. Gpio RegistersGpio Control Registers Eallow Protected GPAMUX1 16. F2808 Gpio MUX TableGPAMUX1/2 GPAMUX2 Time between samples GPyCTRL Reg GPIOx Sync Sysclkout Hardware Development Tools Device and Development Support Tool NomenclatureSoftware Development Tools Prefix Temperature RangeTMS Device Family Literature Documentation SupportTMS320x280x, 2801x Peripheral Selection Guide Peripheral Guide TMS320C28x Application Programming Interface API Reference TMS320x280x to TMS320x2833x or 2823x Migration Overview Application Reports and SoftwareTMS320x281x to TMS320x2833x or 2823x Migration Overview C28x FPU Primer SPRA820 Software Device Support Electrical Specifications Absolute Maximum Ratings1 MIN NOM MAX Unit Electrical CharacteristicsRecommended Operating Conditions Parameter Test Conditions MIN TYP MAX Unit Current Consumption Sysclkout TYP5 MAX6 SCI-A SPI-A ADC TYP4 MAX5 ADC I2C Reducing Current ConsumptionPeripheral DD Current Module SCI SPI IDD IDDA18 Total PowerCurrent Consumption Graphs Iddio Typical Operational Power Versus Frequency C280x Typical Operational Current Versus Frequency C280x Emulator Connection Without Signal Buffering for the DSP EMU0 EMU1 Trst TMS TDI TDO TCK DSP GND Tckret Jtagheader Test Load Circuit Timing Parameter SymbologyGeneral Notes on Timing Parameters 85 pF Device Clock Table TMS320x280x Clock Table and Nomenclature 100-MHz Devices 10. XCLKIN1 Timing Requirements PLL Disabled Clock Requirements and CharacteristicsXCLKIN1 Timing Requirements PLL Enabled Input Clock Frequency 12. Power Management and Supervisory Circuit Solutions Power SequencingPower Management and Supervisory Circuit Solutions Xclkina Xclkoutb Xclkout OSCCLK/8A OSCCLK/8 13. Reset XRS Timing RequirementsXclkout XRS Gpio Output Timing 14. General-Purpose Output Switching CharacteristicsGeneral-Purpose Input/Output Gpio Sysclkout Oscclk OSCCLK/2 Sysclkout Qualprd = 1 SYSCLKOUT/2 Gpio Signal GPxQSELn = 1,0 6 samplesGpio Input Timing Output From Qualifier GPIOxn Sampling Window Width for Input SignalsCase 17. Idle Mode Switching Characteristics1 Low-Power Mode Wakeup Timing16. Idle Mode Timing Requirements1 Address/Data Internal Test Conditions MIN NOM MAX Unit 18. Standby Mode Timing Requirements19. Standby Mode Switching Characteristics Xclkin Xclkout Standby 20. Halt Mode Timing Requirements 21. Halt Mode Switching Characteristics Enhanced Pulse Width Modulator ePWM Timing 23. ePWM Switching CharacteristicsEnhanced Control Peripherals Trip-Zone Input Timing 26. Enhanced Capture eCAP Timing Requirement1 27. eCAP Switching Characteristics29. eQEP Switching Characteristics MIN TYP MAX Unit Parameter 32. External Interrupt Switching Characteristics1External Interrupt Timing Adcsocbo 33. I2C Timing 10.4 I2C Electrical Specification and TimingSerial Peripheral Interface SPI Master Mode Timing Vddio 34. SPI Master Mode External Timing Clock Phase = 0 1 2 3 4 Spistea SpisimoSpisomi Master In Data Must Be Valid 35. SPI Master Mode External Timing Clock Phase = 1 1 2 3 4 Data Valid SpiclkClock polarity = Spisomi SPI Slave Mode Timing 36. SPI Slave Mode External Timing Clock Phase = 01 2 3 4 37. SPI Slave Mode External Timing Clock Phase = 11 2 Spisimo Data Must Be Valid On-Chip Analog-to-Digital Converter ADC Power-Up Control Bit Timing Conversion Modes Analog InputsConverter ADCIN0 ADC Clock Remarks Sequential Sampling Mode Single-Channel Smode =AT 12.5 MHz Sample n Sample n + Simultaneous Sampling Mode Dual-Channel Smode = Detailed Descriptions 46. Flash/OTP Access Timing 43. Flash Endurance for a and S Temperature Material144. Flash Endurance for Q Temperature Material1 Flash Timing Sysclkout ns 48. ROM/OTP Access TimingROM Timing C280x only Flash Flash Random OTP WAIT-STATE Migration Issues ADDITIONS, DELETIONS, and Modifications C280x Thermal Model 100-pin GGM Results F280x Thermal Model 100-pin GGM ResultsF280x Thermal Model 100-pin PZ Results C280x Thermal Model 100-pin PZ Results F2809 Thermal Model 100-pin PZ Results ΨJTC/W Samples Package Type Pins Package Qty Eco Plan LeadOrderable Device Package Qty Eco Plan Lead TMS320F2806GGMA Active TMS320F2802ZGMA ActiveTMS320F2802ZGMS Active Microstar TMS320F2806GGMS Active TMS320F2809ZGMA Active TMS320F2809ZGMS Active 40 MAX GGM S-PBGA-N10010,10 20 TYP 4145257-3/C 12/01Page PZ S-PQFP-G100 Plastic Quad Flatpack Rfid Products ApplicationsDSP