NXP Semiconductors LPC43 Series User Manual

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NXP Semiconductors LPC43 Series User Manual Manual pdf 891 page image

UM10503 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.User manual Rev. 1.3 — 6 July 2012 891 of 1269NXP Semiconductors UM10503Chapter 30: LPC43xx Motor Control PWM (MOTOCONPWM)30.8.7 Three phase AC modeThe three-phase AC-mode is selected by setting the ACMODE bit in the CON register.In this mode, the value of channel 0’s TC is routed to all channels for comparison withtheir MAT registers. (The LIM1-2 registers are not used.)Each channel controls its MCO output by comparing its MAT value to TC0.Figure 104 shows sample waveforms for the six MCO outputs in three-phase AC mode.The POLA bits are set to 0 for all three channels, so that for all MCO outputs the activelevels are high and the passive levels are low. Each channel has a different MAT valuewhich is compared to the TC0 value. In this mode the period value is identical for all threechannels and is determined by LIM0. The dead-time mode is disabled.Fig 103. Three-phase DC mode sample waveformsPOLA0 = 0, INVBDC = 0MCOA2MCOB1MCOA1MCOB0MCOA0MCOB2CCPB1 = 0, off-stateCCPB0 = 0, off-stateCCPA0 = 1, on-stateCCPA2 = 1, on-stateCCPA1 = 1, on-stateCCPB2 = 1, on-state