H8SLASH3006 datasheet(92/796 Pages) RENESAS

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3. MCU Operating Modes

Rev.5.00 Sep. 12, 2007 Page 64 of 764

REJ09B0396-0500

3.4.3

Mode 3

Part of port A function as address pins A

23 to A20, 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. A

23 to A21

are valid when 0 is written in bits 7 to 5 of the bus release control register (BRCR). (In this mode

20 is always used for address output.)

3.4.4

Mode 4

Part of port A function as address pins A

23 to A20, 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. A

23 to A21 are

valid when 0 is written in bits 7 to 5 of BRCR. (In this mode A

20 is always used for address

output.)

3.5

Pin Functions in Each Operating Mode

The pin functions of port 4 and port A vary depending on the operating mode. Table 3.3 indicates

their functions in each operating mode.

Table 3.3

Pin Functions in Each Mode

Port

Mode 1

Mode 2

Mode 3

Mode 4

Port 4

7 to P40*

7 to D0*

7 to P40*

7 to D0*

Port A

7 to PA4

6 to PA4, A20*

Notes: 1. Initial state. The bus mode can be switched by settings in ABWCR. These pins function

as P4

7 to P40 in 8-bit bus mode, and as D7 to D0 in 16-bit bus mode.

2. Initial state. A

20 is always an address output pin. PA6 to PA4 are switched over to A23 to

21 output by writing 0 in bits 7 to 5 of BRCR.

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