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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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H8/3003 数据表(PDF) 71 Page - Renesas Technology Corp |
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H8/3003 数据表(HTML) 71 Page - Renesas Technology Corp |
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71 / 715 page  2.9 Basic Operational Timing 2.9.1 Overview The H8/300H CPU operates according to the system clock (ø). The interval from one rise of the system clock to the next rise is referred to as a “state.” A memory cycle or bus cycle consists of two or three states. The CPU uses different methods to access on-chip memory, the on-chip supporting modules, and the external address space. Access to the external address space can be controlled by the bus controller. 2.9.2 On-Chip Memory Access Timing On-chip memory is accessed in two states. The data bus is 16 bits wide, permitting both byte and word access. Figure 2-15 shows the on-chip memory access cycle. Figure 2-16 indicates the pin states. Figure 2-15 On-Chip Memory Access Cycle T state Bus cycle Internal address bus Internal read signal Internal data bus (read access) Internal write signal Internal data bus (write access) ø 1 T state 2 Read data Address Write data 53 |
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