H8SLASH3002 datasheet(77/700 Pages) RENESAS

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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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