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R8C/20 Datasheet(PDF) 455 Page - Renesas Technology Corp |
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R8C/20 Datasheet(HTML) 455 Page - Renesas Technology Corp |
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455 / 501 page  R8C/20 Group, R8C/21 Group 21. Usage Notes Rev.2.00 Aug 27, 2008 Page 439 of 458 REJ09B0250-0200 • When the value in the TRDGRA0 register is assumed as m, the TRD0 register counts order of m - 1, m, m + 1, m, m - 1 when changing from increment to decrement. When changing from m to m + 1, the IMFA bit is set to 1. Also, the CMD1 to CMD0 bits in the TRDFCR register are set to 11b (complementary PWM mode, buffer data transferred by the compare match in the TRD0 and TRDGRA0 registers), the content in the buffer register (TRDGRD0, TRDGRC1, TRDGRD1) is transferred to the general register (TRDGRB0, TRDGRA1, TRDGRB1). For the order of m + 1, m, m - 1 operation, the IMFA bit remains unchanged and data are not transferred to the register such as the TRDGRA0 register. Figure 21.4 Operation at Compare Match between Registers TRD0 and TRDGRA0 in Complementary PWM Mode No change IMFA bit in TRDSR0 register Transferred from buffer register TRDGRB0 register TRDGRA1 register TRDGRB1 register Count value in TRD0 register Setting value in TRDGRA0 register m m + 1 Set to 0 by a program Not transferred from buffer register When the CMD1 to CMD0 bits in the TRDFCR register are set to 11b. (Transfer from the buffer register to the general register at the compare match of the TRD0 register and TRDGRA0 register) 1 0 |
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