M16C/62 Group DATASHEET

Bus SettingsMitsubishi microcomputersM16C / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTERTable 1.11.2. Pin functions for each processor modeProcessor mode Single-chip Memory expansion mode/microprocessor modesmodeMemoryexpansion modeMultiplexed busspace select bitData bus widthBYTE pin level“01”, “10” “00” “11” (Note 1)Either CS1 or CS2 is formultiplexedmultiplexed bus and othersbus for the(separate bus)are for separate busentirespace8 bits“H”16 bits“L”8 bits“H”16 bits“L”8 bit“H”P00 to P07 I/O port Data bus Data bus Data bus Data bus I/O portP10 to P17 I/O port I/O port Data bus I/O port Data bus I/O portP20 I/O port Address bus Address bus Address bus Address bus Address bus/data bus(Note 2)/data busP21 to P27 I/O port Address bus Address bus Address bus Address bus Address bus/data bus(Note 2) /data bus(Note 2) /data busP30 I/O port Address bus Address bus Address bus Address bus A8/D7/data bus(Note 2)P31 to P37 I/O port Address bus Address bus Address bus Address bus I/O portP40 to P43 I/O port I/O port I/O port /O port I/O port I/O portPort P40 to P43function select bit = 1P40 to P43 I/O port Address bus Address bus Address bus Address bus I/O portPort P40 to P43function select bit = 0P44 to P47P50 to P53I/O portI/O portCS (chip select) or programmable I/O port(For details, refer to “Bus control”)Outputs RD, WRL, WRH, and BCLK or RD, BHE, WR, and BCLK(For details, refer to “Bus control”)P54 I/O port HLDA HLDA HLDA HLDA HLDAP55 I/O port HOLD HOLD HOLD HOLD HOLDP56 I/O port ALE ALE ALE ALE ALEP57 I/O port RDY RDY RDY RDY RDYNote 1: If the entire space is of multiplexed bus in memory expansion mode, choose an 8-bit width.The processor operates using the separate bus after reset is revoked, so the entire space multiplexed bus cannot bechosen in microprocessor mode.The higher-order address becomes a port if the entire space multiplexed bus is chosen, so only 256 bytes can be usedin each chip select.Note 2: Address bus when in separate bus mode.32