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XC878 Product Presentation

XC878 Product Presentation. Capture Compare Unit T2CCU. Table of contents. Introduction into T2CCU. Basic Operation of T2CCU. Practical Usage of T2CCU – Software Examples. Introduction into T2CCU – Overview. T2CCU is a simplified Capture/Compare Unit

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XC878 Product Presentation

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  1. XC878 Product Presentation Capture Compare Unit T2CCU

  2. Table of contents Introduction into T2CCU Basic Operation of T2CCU Practical Usage of T2CCU – Software Examples

  3. Introduction into T2CCU – Overview • T2CCU is a simplified Capture/Compare Unit • one 16bit autoreload timer which counts up • programmable reload value • interrupt on overflow • 6 independent capcom channels interrupt • two selectable time base units: CCT or T2 • clock prescaler options up to ft2ccu = 2x fcpu (48MHz) • synchronize features for CCT & T2 • ADC trigger features

  4. Introduction into T2CCU – Applications • T2CCU can be used for • stepper motor control (full-/half-/microstep) • 6 channel PWM generation (e.g. LED control) • 3 phase PWM with deadtime (motor control, PFC, lampballast) • multiple trigger pulses (e.g. for valve control) • capturing external events

  5. Introduction into T2CCU – SFR view • SFR view of T2CCU and paging working page of T2 working pages of T2CCU

  6. Table of contents Introduction into T2CCU Basic Operation of T2CCU Practical Usage of T2CCU – Software Examples

  7. Basic Operation of T2CCU – Compare Mode 0 PWM Generation • Compare Mode 0: • output change (set / reset) on • compare and overflow • up to 6 channels • 2 can be combined with PolA/B and deadtime for 3 phase halfbridge control • shadow transfer mechanism for compare value update • update compare channels • set TXOF • clear TXOF • compare value is active with next timer overflow • note: compare value must not be smaller than reload value Example: 3 phase sine wave generation with deadtime EX: T2CCU_1

  8. Basic Operation of T2CCU – Compare Mode 1 Pulse Pattern Generation • Compare Mode 1: • output latch is updated by hardware on compare event • timing of the update is dependent on channel individual compare • level of the output latch can be programmed to COOUTx register • output change (set / reset) on • compare only (not on overflow) • two shadow transfer mechanism for • compare and COOUTx update • use TXOF for timer synch. update • use ENSHDW for immediate update • note: compare value must not be smaller than reload value • note: take care for update in realtime

  9. Basic Operation of T2CCU – Compare Mode 1 Pulse Pattern Generation • Compare Mode 1: • use this mode for flexible pulse pattern generation • use TXOF for timer synchronous update for shadow transfer of all compare values Example: Overlapping pulse pattern with variable distance EX: T2CCU_2

  10. Basic Operation of T2CCU – Concurrent Compare Mode Stepper Motor Control • Concurrent Compare Mode: • similar to Compare Mode 1 • but only Compare 0 register has to be written • Stepper Motor Control • fullstep / halfstep mode • timer period refers to speed • equidistant compare values • use ENSHDW to update next compare value • pattern & time schedule table can be used • note: realtime update is mandatory Example: Stepper motor pattern for fullstep mode EX: T2CCU_3

  11. Basic Operation of T2CCU – Capture Mode Capturing External Events • Capture Modes : • capture external events on • rising / falling / both edges • soft-capture – read actual timervalue • individual interrupt flags for every capture event • note: take care on timer overflow while capturing Example: T2CC0-Capturing a sawtooth signal from T13 EX: T2CCU_4

  12. Table of contents Introduction into T2CCU Basic Operation of T2CCU Practical Usage of T2CCU – Software Examples

  13. T2CCU together with DAvE v11 • Note: DAvE version V1.1 needs some manual adaptations in initialization file CCU.C • This is necessary in case of usage of immediate shadow transfer request via ENSHDW

  14. Practical Usage of T2CCU – Example 13 phase sine wave generation with deadtime • Use Excel Spreadsheet for SineTab.c • Motor Control example for 3 phase halfbridge • Sine-Generation very much simplified • T2CCU Settings • compare mode 0 • PolA/PolB with deadtime • update compare value inside CCT overflow interrupt (TXOV) • used pins • P30/32/34/35/P06/07 • CCT runs at 48MHz • 12bit res.@20kHz PWM What does the example do? • Add SineTab.c to project

  15. Practical Usage of T2CCU – Example 13 phase sine wave generation with deadtime • CCT overflow interrupt • update duty cycle from table • request shadow transfer (using TXOV) • Copy following code • shared_int.c if (T2CCU_CCTCON & 0x08) { // a Capture/Compare Timer (CCT) Overflow has occured T2CCU_CCTCON &= ~(ubyte)0x08; // clear CCTOVF // USER CODE BEGIN (SHINT_XINTR5Isr,5) SFR_PAGE(_t2_2, SST1); TXOV = 0; // clr TXOV to ensure simultaneous // update of all channels SFR_PAGE(_t2_0, RST1); idxA++; if (idxA > 119) idxA=0; i= SineTab[idxA]; CCU_vLoadChannelCapCompRegister_0(SineTab[idxA]); CCU_vLoadChannelCapCompRegister_1(SineTab[idxA]); idxB++; if (idxB > 119) idxB=0; CCU_vLoadChannelCapCompRegister_2(SineTab[idxB]); CCU_vLoadChannelCapCompRegister_3(SineTab[idxB]); idxC++; if (idxC > 119) idxC=0; CCU_vLoadChannelCapCompRegister_4(SineTab[idxC]); CCU_vLoadChannelCapCompRegister_5(SineTab[idxC]); SFR_PAGE(_t2_2, SST1); TXOV = 1; // request shadow transfer // with next overflow SFR_PAGE(_t2_0, RST1); // USER CODE END } What to do in software?

  16. Practical Usage of T2CCU – Example 13 phase sine wave generation with deadtime • Scope Screenshots Scope Screenshot back

  17. Practical Usage of T2CCU – Example 2Overlapping pulse pattern with variable distance • Pulse Pattern Example • generate signals with accurate timing to each other • variable delta between the signals, constant period • T2CCU Settings • compare mode 1 • 4 channels – T2CC0/1/2/3 • update compare values at CCT overflow using TXOF • used pins • P30/32/34/35 What does the example do?

  18. Practical Usage of T2CCU – Example 2Overlapping pulse pattern with variable distance • CCT overflow interrupt • update next compare value • request shadow transfer using TXOV • Copy following code • shared_int.c if (T2CCU_CCTCON & 0x08) { // a Capture/Compare Timer (CCT) Overflow has occured T2CCU_CCTCON &= ~(ubyte)0x08; // clear CCTOVF // USER CODE BEGIN (SHINT_XINTR5Isr,5) P3_DATA ^= 0x80; // trigger synch delta += 0x400; if (delta == 0x4000) delta = 0; ch0 = 0x4000; ch1 = ch0 + 0x8000 + delta; ch2 = ch0 + 0xA000 - delta; ch3 = 0xA000 + delta; SFR_PAGE(_t2_2, SST0); T2CCU_COSHDW &= ~0x40; // clear TXOV because it is sticky CCU_vLoadChannelCapCompRegister_0(ch0); CCU_vLoadChannelCapCompRegister_1(ch1); CCU_vLoadChannelCapCompRegister_2(ch2); CCU_vLoadChannelCapCompRegister_3(ch3); T2CCU_COSHDW ^= 0x0F; // clr T2CCU.1 T2CCU_COSHDW |= 0x40; // shadow transfer request on next TXOV // USER CODE END } What to do in software?

  19. Practical Usage of T2CCU – Example 2Overlapping pulse pattern with variable distance • Scope Screenshots Scope Screenshot back

  20. Practical Usage of T2CCU – Example 3Stepper motor pattern for fullstep mode • Stepper Motor Example • Full Step Mode • T2CCU Settings • concurrent compare mode • 4 channels – T2CC0/1/2/3 • update compare values inside T2CCU0 channel interrupt (using ENSHDW) • used pins • P30/32/34/35 • Note: shadow transfer request needs concurrent write to ENSHDW and COOUT0 What does the example do?

  21. Practical Usage of T2CCU – Example 3Stepper motor pattern for fullstep mode • T2CCU Channel 0 interrupt • update next compare value • request shadow transfer using • ENSHDW together with CCOUT0 • T2CCU_COSHDW = 0x81; • Copy following code • shared_int.c • Copy following code • ccu.c • because of Dave v11 malfunction if (IRCON0 & 0x08) { IRCON0 &= ~(ubyte)0x08; // clear EXINT3 // USER CODE BEGIN (SHINT_XINTR9Isr ,3) for (i=0x40; i>0; i--); switch (c) { case 0: CCU_vLoadChannelCapCompRegister_0(0xBFFF); CCU_vEnableCompareChannelOutput(0x01); SFR_PAGE(_t2_2, SST1); T2CCU_COSHDW = 0x81; SFR_PAGE(_t2_0, RST1); c++; break; case 1: CCU_vLoadChannelCapCompRegister_0(0xCFFF); CCU_vEnableCompareChannelOutput(0x02); SFR_PAGE(_t2_2, SST1); T2CCU_COSHDW = 0x81; SFR_PAGE(_t2_0, RST1); c++; break; etc.... } /// ---------------------------------------------- /// Configuration of Peripheral Input Selection: /// ---------------------------------------------- // USER CODE BEGIN (T2CCU_Init,3) // ENSHDW must be enabled together with COOUTx bits // Dave malfunction SFR_PAGE(_t2_2, noSST); // switch to page 2 T2CCU_COSHDW = 0xBF; // load Compare // Shadow register // USER CODE END What to do in software?

  22. Practical Usage of T2CCU – Example 3Stepper motor pattern for fullstep mode • Scope Screenshots Scope Screenshot? back

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