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HD6432127RW Datasheet(PDF) 97 Page - Renesas Technology Corp |
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HD6432127RW Datasheet(HTML) 97 Page - Renesas Technology Corp |
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97 / 843 page  73 Section 3 MCU Operating Modes 3.1 Overview 3.1.1 Operating Mode Selection The H8S/2128 Series and H8S/2124 Series have three operating modes (modes 1 to 3). These modes enable selection of the CPU operating mode and enabling/disabling of on-chip ROM, by setting the mode pins (MD1 and MD0). Table 3.1 lists the MCU operating modes. Table 3.1 MCU Operating Mode Selection MCU Operating Mode MD1 MD0 CPU Operating Mode Description On-Chip ROM 0 00— — — 1 1 Normal Expanded mode with on-chip ROM disabled Disabled 2 1 0 Advanced Expanded mode with on-chip ROM enabled Single-chip mode Enabled 3 1 Normal Expanded mode with on-chip ROM enabled Single-chip mode The CPU’s architecture allows for 4 Gbytes of address space, but the H8S/2128 Series and H8S/2124 Series actually access a maximum of 16 Mbytes. However, as there are 16 external address output pins, advanced mode is enabled only in single-chip mode or in expanded mode with on-chip ROM enabled when a specific area in the external address space is accessed using IOS. The external data bus width is 8 bits. Mode 1 is an externally expanded mode that allows access to external memory and peripheral devices. With modes 2 and 3, operation begins in single-chip mode after reset release, but a transition can be made to external expansion mode by setting the EXPE bit in MDCR. The H8S/2128 Series and H8S/2124 Series can only be used in modes 1 to 3. These means that the mode pins must select one of these modes. Do not changes the inputs at the mode pins during operation. |
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