HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 117

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

3.3
3.3.1
The CPU can access a 64-kbyte address space in normal mode. The on-chip ROM is disabled, and
8-bit bus mode is set, immediately after a reset.
Ports B and C function as an address bus, port D functions as a data bus, and part of port F carries
bus control signals. However, note that if 16-bit access is designated by the bus controller, the bus
mode switches to 16 bits and port E becomes a data bus.
3.3.2
The CPU can access a 64-kbyte address space in normal mode. The on-chip ROM is enabled, and
8-bit bus mode is set immediately after a reset.
Ports 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. However, note that if 16-bit
access is designated by the bus controller, the bus mode switches to 16 bits and port E becomes a
data bus.
The amount of on-chip ROM that can be used on the H8S/2246, H8S/2245, H8S/2244, and
H8S/2243 is limited to 56 kbytes.
Note: Mode 2 cannot be used in the H8S/2240.
3.3.3
The CPU can access a 64-kbyte address space in normal mode. The on-chip ROM is enabled, but
external addresses cannot be accessed.
All I/O ports are available for use as input-output ports.
The amount of on-chip ROM that can be used on the H8S/2246, H8S/2245, H8S/2244, and
H8S/2243 is limited to 56 kbytes.
Note: Mode 3 cannot be used in the H8S/2240.
Mode 1
Mode 2
Mode 3
Operating Mode Descriptions
Rev.3.00 Mar. 26, 2007 Page 75 of 772
Section 3 MCU Operating Modes
REJ09B0355-0300