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H8/3021 Datasheet(PDF) 273 Page - Renesas Technology Corp |
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H8/3021 Datasheet(HTML) 273 Page - Renesas Technology Corp |
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273 / 712 page  8. 16-Bit Integrated Timer Unit (ITU) Rev.2.00 Mar. 22, 2007 Page 249 of 684 REJ09B0352-0200 Examples of Complementary PWM Mode: Figure 8.35 shows an example of operation in complementary PWM mode. TCNT3 and TCNT4 operate as up/down-counters, counting down from compare match between TCNT3 and GRA3 and counting up from the point at which TCNT4 underflows. During each up-and-down counting cycle, PWM waveforms are generated by compare match with general registers GRB3, GRA4, and GRB4. Since TCNT3 is initially set to a higher value than TCNT4, compare match events occur in the sequence TCNT3, TCNT4, TCNT4, TCNT3. TCNT3 and TCNT4 values Down-counting starts at compare match between TCNT3 and GRA3 Time GRA3 GRB3 GRA4 GRB4 H'0000 TIOCA3 TIOCB3 TIOCA4 TOCXA4 TIOCB4 TOCXB4 TCNT3 TCNT4 Up-counting starts when TCNT4 underflows Figure 8.35 Operation in Complementary PWM Mode (Example 1) (when OLS3 = OLS4 = 1) |
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