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M16C User Manual.pdf

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External BusesMitsubishi microcomputers<strong>M16C</strong> / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTERBCLKHOLDHLDAALECSnADiDBiRD/WRIndeterminateHiZHiZHiZHiZBus released(1) (2) (3) (4) (5)(6) (7)(8)(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.Figure 5.6.1. Example of releasing the external bus5.7 Precautions for External Bus(1) The external ROM version can operate only in the microprocessor mode, so be sure to performthe following:• Connect the CNVSS pin to Vcc.• Fix the processor mode bits (b1 and b0) to “112”.541

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