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数据搜索系统，热门电子元器件搜索 |
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H8/3028F 数据表(PDF) 209 Page - Renesas Technology Corp |
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H8/3028F 数据表(HTML) 209 Page - Renesas Technology Corp |
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209 / 923 page  Rev. 2.00, 09/03, page 179 of 890 6.8.2 Basic Timing The number of states in the initial cycle (full access) and a burst cycle of the burst ROM interface is determined by the setting of the AST0 bit in ASTCR. When the AST0 bit is set to 1, wait states can also be inserted in the initial cycle. Wait states cannot be inserted in a burst cycle. Burst access of up to four words is performed when the BRSTS0 bit is cleared to 0 in BCR, and burst access of up to eight words when the BRSTS0 bit is set to 1. The number of burst access states is two when the BRSTS1 bit is cleared to 0, and three when the BRSTS1 bit is set to 1. The basic access timing for burst ROM space is shown in figure 6.42. φ T1 T2 T3 T1 T2 T1 T2 RD AS CS0 Full access Burst access Address bus Only lower address changes Read data Read data Read data Data bus Figure 6.42 Example of Burst ROM Access Timing 6.8.3 Wait Control As with the basic bus interface, either program wait insertion or pin wait insertion using the WAIT pin can be used in the initial cycle (full access) of the burst ROM interface. Wait states cannot be inserted in a burst cycle. |
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