H8S2245 datasheet(118/818 Pages) RENESAS

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Section 3 MCU Operating Modes

Rev.3.00 Mar. 26, 2007 Page 76 of 772

REJ09B0355-0300

3.3.4

Mode 4

The CPU can access a 16-Mbyte address space in advanced mode. The on-chip ROM is disabled.

Pins P1

3 to P10, and ports A, B, and C function as an address bus, ports D and E function as a data

bus, and part of port F carries bus control signals. Pins P1

3 to P10 function as input ports

immediately after a reset. They can each be set to output address use by setting the corresponding

bits in the data direction register (DDR) to 1.

The initial bus mode after a reset is 16 bits, with 16-bit access to all areas. However, note that if 8-

bit access is designated by the bus controller for all areas, the bus mode switches to 8 bits.

3.3.5

Mode 5

The CPU can access a 16-Mbyte address space in advanced mode. The on-chip ROM is disabled.

Pins P1

3 to P10, and ports A, B, and C function as an address bus, ports D functions as a data bus,

and part of port F carries bus control signals. Pins P1

3 to P10 function as input ports immediately

after a reset. They can each be set to output address use by setting the corresponding bits in the

data direction register (DDR) to 1.

The initial bus mode after a reset is 8 bits, with 8-bit access to all areas. However, note that if at

least one area is designated for 16-bit access by the bus controller, the bus mode switches to 16

bits and port E becomes a data bus.

3.3.6

Mode 6

The CPU can access a 16-Mbyte address space in advanced mode. The on-chip ROM is enabled.

Pins P1

3 to P10, and ports A, B, and C function as input ports immediately after a reset. They can

each be set to output addresses by setting the corresponding bits in the data direction register

(DDR) to 1. Port D functions as a data bus, and part of port F carries bus control signals.

The initial bus mode after a reset is 8 bits, with 8-bit access to all areas. However, note that if at

least one area is designated for 16-bit access by the bus controller, the bus mode switches to 16

bits and port E becomes a data bus.

Note:

Mode 6 cannot be used in the H8S/2240.

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