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H8/3003 数据表(PDF) 150 Page - Renesas Technology Corp |
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H8/3003 数据表(HTML) 150 Page - Renesas Technology Corp |
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150 / 715 page  6.4 Usage Notes 6.4.1 Connection to Dynamic RAM and Pseudo-Static RAM A different bus control signal timing applies when dynamic RAM or pseudo-static RAM is connected to area 3. For details see section 7, Refresh Controller. 6.4.2 Register Write Timing ABWCR, ASTCR, and WCER Write Timing: Data written to ABWCR, ASTCR, or WCER takes effect starting from the next bus cycle. Figure 6-20 shows the timing when an instruction fetched from area 0 changes area 0 from three-state access to two-state access. Figure 6-20 ASTCR Write Timing ø Address T1 T2 T3 T1 T2 T3 T1 T2 ASTCR address 3-state access to area 0 2-state access to area 0 132 |
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