H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 108

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 3 MCU Operating Modes
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 is limited to 56 kbytes.
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 is limited to 56 kbytes.
Rev. 3.00 Sep 15, 2006 page 74 of 988
REJ09B0330-0300
Operating Mode Descriptions
Mode 1
Mode 2 (H8S/2351 Only)
Mode 3 (H8S/2351 Only)