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H8S2245 Datasheet(PDF) 370 Page - Renesas Technology Corp |
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H8S2245 Datasheet(HTML) 370 Page - Renesas Technology Corp |
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370 / 818 page  Section 9 16-Bit Timer Pulse Unit (TPU) Rev.3.00 Mar. 26, 2007 Page 328 of 772 REJ09B0355-0300 9.4.4 Buffer Operation Buffer operation, provided for channel 0 enables TGRC and TGRD to be used as buffer registers. Buffer operation differs depending on whether TGR has been designated as an input capture register or as a compare match register. Table 9.5 shows the register combinations used in buffer operation. Table 9.5 Register Combinations in Buffer Operation Channel Timer General Register Buffer Register 0TGR0A TGR0C TGR0B TGR0D When TGR is an output compare register: When a compare match occurs, the value in the buffer register for the corresponding channel is transferred to the timer general register. This operation is illustrated in figure 9.16. Buffer register Timer general register TCNT Comparator Compare match signal Figure 9.16 Compare Match Buffer Operation When TGR is an input capture register: When input capture occurs, the value in TCNT is transferred to TGR and the value previously held in the timer general register is transferred to the buffer register. This operation is illustrated in figure 9.17. |
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