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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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H8S2245 数据表(PDF) 113 Page - Renesas Technology Corp |
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H8S2245 数据表(HTML) 113 Page - Renesas Technology Corp |
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113 / 818 page  Section 3 MCU Operating Modes Rev.3.00 Mar. 26, 2007 Page 71 of 772 REJ09B0355-0300 Section 3 MCU Operating Modes 3.1 Overview 3.1.1 Operating Mode Selection Except for the H8S/2240, all H8S/2245 Group products have seven operating modes (modes 1 to 7). The H8S/2240 has three operating modes (modes 1, 4, and 5). These modes enable selection of the CPU operating mode, enabling/disabling of on-chip ROM, and the initial bus width setting, by setting the mode pins (MD 2 to MD0). Table 3.1 lists the MCU operating modes. Table 3.1 MCU Operating Mode Selection External Data Bus MCU Operating Mode MD 2 MD 1 MD 0 CPU Operating Mode Description On-chip ROM Initial Width Max. Width 0 000— — — — — 1 1 Normal On-chip ROM disabled, expanded mode Disabled 8 bits 16 bits 2* 1 0 On-chip ROM enabled, expanded mode Enabled 8 bits 16 bits 3* 1 Single-chip mode — — 4 100Advanced Disabled 16 bits 16 bits 51 On-chip ROM disabled, expanded mode 8 bits 16 bits 6* 1 0 On-chip ROM enabled, expanded mode Enabled 8 bits 16 bits 7* 1 Single-chip mode — — Note: * Cannot be used in the H8S/2240. The CPU's architecture allows for 4 Gbytes of address space, but the H8S/2245 Group actually accesses a maximum of 16 Mbytes. Modes 1, 2, and 4 to 6 are externally expanded modes that allow access to external memory and peripheral devices. |
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