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M16C/62 Datasheet(PDF) 523 Page - Renesas Technology Corp |
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M16C/62 Datasheet(HTML) 523 Page - Renesas Technology Corp |
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523 / 621 page  External Buses Mitsubishi microcomputers M16C / 62 Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER 508 5.1 Overview of External Buses Memory and I/O external expansion can be attained in either the memory expansion mode or the micro- processor mode. When accessing an external area in either mode, 8-bit data bus width or 16-bit data bus width can be selected, based on the BYTE pin level. 16-bit width is used to access an internal area, regardless of the level of the BYTE pin. Fix the BYTE pin either to “H” or “L” level. 8-bit and 16-bit data bus widths cannot be used together in an external area. Addresses (A0 through A19) for accessing a memory space of up to 1M bytes, as well as chip selects _______ _______ (CS0 through CS3) which indicate areas resulting from dividing a 1M bytes space into four, can be output in both the memory expansion mode and microprocessor mode. Table 5.1.1. Memory space expansion mode and memory spaces Expansion mode Normal mode Expansion mode 1 Expansion mode 2 Accesible memory space Up to 1M byte Up to 1.2M byte Up to 4M byte |
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