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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SH7708 데이터시트(PDF) 332 Page - Renesas Technology Corp |
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SH7708 데이터시트(HTML) 332 Page - Renesas Technology Corp |
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332 / 633 page  314 Auto-Reload Count Operation: Figure 11.3 shows the TCNT auto-reload operation. TCNT value TCOR H'00000000 STR0–STR2 UNF TCOR value set to TCNT during underflow Time Figure 11.3 Auto-Reload Count Operation TCNT Count Timing: • Internal Clock Operation: Set the TPSC2–TPSC0 bits in TCR to select whether peripheral module clock P φ or one of the four internal clocks created by dividing it is used (Pφ/4, Pφ/16, P φ/64, Pφ/256). Figure 11.4 shows the timing. P φ Internal clock TCNT input clock TCNT N + 1 N N – 1 Figure 11.4 Count Timing when Internal Clock Is Operating • External Clock Operation: Set the TPSC2–TPSC0 bits in TCR to select the external clock (TCLK) as the timer clock. Use the CKEG1 and CKEG0 bits in TCR to select the detection edge. Rise, fall or both may be selected. The pulse width of the external clock must be at least 1.5 peripheral module clock cycles for single edges or 2.5 peripheral module clock cycles for both edges. A shorter pulse width will result in inaccurate operation. Figure 11.5 shows the timing for both-edge detection. |
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