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SH7708 数据表(PDF) 255 Page - Renesas Technology Corp |
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SH7708 数据表(HTML) 255 Page - Renesas Technology Corp |
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255 / 633 page ![]() 237 When software wait insertion is specified by WCR2, the external wait input WAIT signal is also sampled. WAIT pin sampling is shown in figure 10.11. A 2-cycle wait is specified as a software wait. Sampling is performed at the transition from the Tw state to the T2 state; therefore, the WAIT signal has no effect if asserted in the T1 cycle or the first Tw cycle. The WAIT signal is sampled on the rising edge of the clock. WAIT is a synchronous signal. T1 CKIO A25 to A0 CSn RD/ WR RD D31 to D0 WEn D31 to D0 WAIT Tw Tw Tw T2 Read Write BS Wait states inserted by WAIT signal Figure 10.11 Basic Interface Wait State Timing (Wait State Insertion by WAIT Signal) |
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