HD6413002 Datasheet, PDF (77/700 Pages) Renesas Technology Corp – High-performance single-chip microcontroller

3.4 Operating Mode Descriptions
3.4.1 Mode 1
Address pins A₁₉ to A₀ are enabled, permitting access to a maximum 1-Mbyte address space. The
initial bus mode after a reset is 8 bits, with 8-bit access to all areas. If at least one area is
designated for 16-bit access in ABWCR, the bus mode switches to 16 bits.
3.4.2 Mode 2
Address pins A₁₉ to A₀ are enabled, permitting access to a maximum 1-Mbyte address space. The
initial bus mode after a reset is 16 bits, with 16-bit access to all areas. If all areas are designated
for 8-bit access in ABWCR, the bus mode switches to 8 bits.
3.4.3 Mode 3
Address pins A₂₃ to A₀ are enabled, permitting access to a maximum 16-Mbyte address space.
The initial bus mode after a reset is 8 bits, with 8-bit access to all areas. If at least one area is
designated for 16-bit access in ABWCR, the bus mode switches to 16 bits. A₂₃ to A₂₁ are valid
when 0 is written in bits 7 to 5 of the bus release control register (BRCR).
3.4.4 Mode 4
Address pins A₂₃ to A₀ are enabled, permitting access to a maximum 16-Mbyte address space.
The initial bus mode after a reset is 16 bits, with 16-bit access to all areas. If all areas are
designated for 8-bit access in ABWCR, the bus mode switches to 8 bits. A₂₃ to A₂₁ are valid
when 0 is written in bits 7 to 5 of BRCR.
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