HD6413008VF25 Datasheet, PDF (106/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

3. MCU Operating Modes
3.4 Operating Mode Descriptions
3.4.1 Mode 1
Ports 1, 2, and 5 function as address pins A₁₉ to A₀, 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
Ports 1, 2, and 5 function as address pins A₁₉ to A₀, 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
Ports 1, 2, and 5 and part of port A function as address pins A₂₃ to A₀, 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). (In this mode A₂₀ is always used for address output.)
3.4.4 Mode 4
Ports 1, 2, and 5 and part of port A function as address pins A₂₃ to A₀, 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. (In this mode A₂₀ is always
used for address output.)
3.4.5 Modes 5 to 7
These modes cannot be used in the H8/3008. Pin settings must not be made for these modes.
Rev.4.00 Aug. 20, 2007 Page 60 of 638
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