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H8/3021 Datasheet(PDF) 145 Page - Renesas Technology Corp |
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H8/3021 Datasheet(HTML) 145 Page - Renesas Technology Corp |
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145 / 712 page  6. Bus Controller Rev.2.00 Mar. 22, 2007 Page 121 of 684 REJ09B0352-0200 Pin Wait Mode 1: In all accesses to external three-state-access areas, the number of wait states (T W) selected by bits WC1 and WC0 are inserted. If the WAIT pin is low at the fall of the system clock ( φ) in the last of these wait states, an additional wait state is inserted. If the WAIT pin remains low, wait states continue to be inserted until the WAIT signal goes high. Pin wait mode 1 is useful for inserting four or more wait states, or for inserting different numbers of wait states for different external devices. If the wait count is 0, this mode operates in the same way as pin wait mode 0. Figure 6.6 shows the timing when the wait count is 1 (WC1 = 0, WC0 = 1) and one additional wait state is inserted by WAIT input. Address bus Data bus AS RD WR T1 T2 TW TW T3 Write data * Read data * Read access Write access Note: * Arrows indicate time of sampling of the WAIT pin. φ pin WAIT Data bus External address Write data Inserted by wait count Inserted by signal WAIT Figure 6.6 Pin Wait Mode 1 |
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