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H8S/2218 数据表(PDF) 119 Page - Renesas Technology Corp |
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H8S/2218 数据表(HTML) 119 Page - Renesas Technology Corp |
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119 / 750 page  Section 3 MCU Operating Modes Rev.6.00 Jun. 03, 2008 Page 71 of 698 REJ09B0074-0600 Section 3 MCU Operating Modes 3.1 Operating Mode Selection This LSI supports four operating modes (modes 4 to 7). 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 (MD2 to MD0) as show in table 3.1. Modes 4 to 6 are external extended modes that allow access to the external memory and peripheral devices. In external extended mode, 8-bit or 16-bit address space can be set for each area depending on the bus controller setting after program execution starts. If 16-bit access is selected for any one area, 16-bit bus mode is set; if 8-bit access is selected for all areas, 8-bit bus mode is set. In mode 7, the external address space cannot be used. Do not change the mode pin settings during operation. Only mode 7 is available in the H8S/2212 Group. Table 3.1 MCU Operating Mode Selection External Data Bus MCU Operating Mode MD2 MD1 MD0 CPU Operating Mode Description On-chip ROM Initial Value Maximum Value 4 1 0 0 Advanced mode On-chip ROM disabled, extended mode Disabled 16 bits 16 bits 5 1 0 1 Advanced mode On-chip ROM disabled, extended mode Disabled 8 bits 16 bits 6 1 1 0 Advanced mode On-chip ROM enabled, extended mode Enabled 8 bits 16 bits 7 1 1 1 Advanced mode Single-chip mode Enabled – – Note: When using the E6000 emulator: • Mode 7 is not available in the H8S/2218 Group. (The E6000 emulator does not support mode 7.) • Note following restrictions to use the RTC and USB in mode 6. Specify PFCR so that A9 and A8 are output on the PB1 and PB0 pins. Set H'FF in PCDDR so that A7 to A0 are output on the PC7 to PC0 pins. |
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