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SH7021 Datasheet(PDF) 292 Page - Renesas Technology Corp |
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SH7021 Datasheet(HTML) 292 Page - Renesas Technology Corp |
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292 / 509 page  276 RENESAS Buffer Mode Operation: Figure 10.48 shows an example of an operation in the buffer mode with GRA set as an output compare register and GRA and buffer register A (BRA) set for buffer operation. The TCNT operates as a periodic counter that is cleared by GRB compare match. TIOCA and TIOCB are set to toggle at compare matches A and B. Since buffer mode is selected, when TIOCA toggles at a compare match A, the BRA value is simultaneously transferred to the GRA. This operation is repeated at every compare match A. The transfer timing is shown in figure 10.49. GRB H' 0250 H' 0200 H' 0100 H' 0000 BRA GRA TIOCB TIOCA H' 0200 H' 0100 H' 0200 H' 0250 H' 0200 H' 0200 TCNT value Counter cleared by compare match B Time Toggle output Toggle output Compare match A H' 0100 Figure 10.48 Buffer Mode Operation Example 1 (Output Compare Register) |
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