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TMS570LS3137 Datasheet(PDF) 129 Page - Texas Instruments |
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TMS570LS3137 Datasheet(HTML) 129 Page - Texas Instruments |
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129 / 173 page  TMS570LS3137 www.ti.com SPNS162C – APRIL 2012 – REVISED APRIL 2015 Table 7-11. Input Timing Requirements for the N2HET Input Capture Functionality NO. MIN(1) (2) MAX(1) (2) UNIT Input signal period, PCNT or WCAP for rising edge to rising 1 2 (hr) (lr) tc(VCLK2) + 2 225 (hr) (lr) tc(VCLK2) - 2 ns edge Input signal period, PCNT or WCAP for falling edge to falling 2 2 (hr) (lr) tc(VCLK2) + 2 225 (hr) (lr) tc(VCLK2) - 2 ns edge Input signal high phase, PCNT or WCAP for rising edge to 3 (hr) (lr) tc(VCLK2) + 2 225 (hr) (lr) tc(VCLK2) - 2 ns falling edge Input signal low phase, PCNT or WCAP for falling edge to 4 (hr) (lr) tc(VCLK2) + 2 225 (hr) (lr) tc(VCLK2) - 2 ns rising edge (1) hr = High-resolution prescaler, configured using the HRPFC field of the Prescale Factor Register (HETPFR). (2) lr = Loop-resolution prescaler, configured using the LFPRC field of the Prescale Factor Register (HETPFR). Both N2HET1 and N2HET2 have channels that are enhanced to be able to capture inputs with smaller pulse widths than that specified in Table 7-11. See Table 7-13 for a list of which pins support small pulse capture. The input capture capability for these channels is specified in Table 7-12. Table 7-12. Input Timing Requirements for N2HET Channels with Enhanced Pulse Capture NO. MIN MAX UNIT Input signal period, PCNT or WCAP for rising edge to rising 1 (hr) (lr) tc(VCLK2) + 2 225 (hr) (lr) tc(VCLK2) - 2 ns edge Input signal period, PCNT or WCAP for falling edge to falling 2 (hr) (lr) tc(VCLK2) + 2 225 (hr) (lr) tc(VCLK2) - 2 ns edge Input signal high phase, PCNT or WCAP for rising edge to 3 2 (hr) tc(VCLK2) + 2 225 (hr) (lr) tc(VCLK2) - 2 ns falling edge Input signal low phase, PCNT or WCAP for falling edge to 4 2 (hr) tc(VCLK2) + 2 225 (hr) (lr) tc(VCLK2) - 2 ns rising edge Table 7-13. Input Capture Pin Capability CHANNEL SUPPORTS 32-BIT CAPTURE ENHANCED PULSE CAPTURE N2HET1[00] Yes No N2HET1[01] Yes No N2HET1[02] Yes No N2HET1[03] Yes No N2HET1[04] Yes No N2HET1[05] Yes No N2HET1[06] Yes No N2HET1[07] Yes No N2HET1[08] Yes No N2HET1[09] Yes No N2HET1[10] Yes No N2HET1[11] Yes No N2HET1[12] Yes No N2HET1[13] Yes No N2HET1[14] Yes No N2HET1[15] Yes Yes N2HET1[16] Yes No N2HET1[17] Yes No N2HET1[18] Yes No N2HET1[19] Yes No N2HET1[20] Yes Yes Copyright © 2012–2015, Texas Instruments Incorporated Peripheral Information and Electrical Specifications 129 Submit Documentation Feedback |
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