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UCD3138 数据表(PDF) 24 Page - Texas Instruments |
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UCD3138 数据表(HTML) 24 Page - Texas Instruments |
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24 / 99 page  This is achieved by providing the DPWM mechanism with 16 phase shifted clock signals of 250 MHz each. The high resolution section of DPWM can be enabled or disabled, also the resolution can be defined in several steps between 4ns to 250ps. This is done by setting the values of PWM_HR_MULTI_OUT_EN, HIRES_SCALE, and ALL_PHASE_CLK_ENA inside the DPWM Control register 1. See the Power Peripherals programmer’s manual for details. 8.8.1.5 Oversampling The DPWM module has the capability to trigger an oversampling event by initiating the EADC to sample the error voltage. The default 00 configuration has the DPWM trigger the EADC once based on the sample trigger register value. The over sampling register has the ability to trigger the sampling 2, 4 or 8 times per PWM period. Thus the time the over sample happens is at the divide by 2, 4, or 8 time set in the sampling register. The 01 setting triggers 2X oversampling, the 10 setting triggers 4X over sampling, and the 11 triggers oversampling at 8X. 8.8.1.6 DPWM Interrupt Generation The DPWM has the capability to generate a CPU interrupt based on the PWM frequency programmed in the period register. The interrupt can be scaled by a divider ratio of up to 255 for developing a slower interrupt service execution loop. This interrupt can be fed to the ADC circuitry for providing an ADC12 trigger for sequence synchronization. Table 8-3 outlines the divide ratios that can be programmed. 8.8.1.7 DPWM Interrupt Scaling/Range Table 8-3. DPWM Interrupt Divide Ratio Interrupt Divide Setting Interrupt Divide Count Interrupt Divide Count (hex) Switching Period Frames (Assume 1-MHz Loop) Number of 32-MHz Processor Cycles 1 0 00 1 32 2 1 01 2 64 3 3 03 4 128 4 7 07 8 256 5 15 0F 16 512 6 31 1F 32 1024 7 47 2F 48 1536 8 63 3F 64 2048 9 79 4F 80 2560 10 95 5F 96 3072 11 127 7F 128 4096 12 159 9F 160 5120 13 191 BF 192 6144 14 223 DF 224 7168 15 255 FF 256 8192 UCD3138 SLUSAP2J – MARCH 2012 – REVISED NOVEMBER 2021 www.ti.com 24 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: UCD3138 |
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