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M30620FCAFP 数据表(PDF) 559 Page - Renesas Technology Corp |
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M30620FCAFP 数据表(HTML) 559 Page - Renesas Technology Corp |
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559 / 615 page ![]() External Buses Mitsubishi microcomputers M16C / 62A Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER 2-242 4.6 Precautions for External Bus (1) The external ROM version can operate only in the microprocessor mode, so be sure to per- form the following: • Connect the CNVSS pin to Vcc. (1) An “L” level is input to the HOLD pin. (2) HOLD is detected. (3) The CPU releases the bus. (4) An “L” is output to the HLDA pin. (5) An “H” is input to the HOLD pin. (6) An “H” is output to the HLDA pin. (7) The CPU not releases the bus. (8) The CPU resumes using the bus. BCLK DBi HOLD HLDA ALE ADi (1) (2) (3) (4) (5)(6) (7) Bus released (8) Indeterminate HiZ HiZ HiZ HiZ CSn RD/WR Figure 4.5.1. Example of releasing the external bus |
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