HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 143

• Manufacturer Part Number: HD6412373R
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

3.3
3.3.1
The CPU can access a 16-Mbyte address space in advanced mode. The on-chip ROM is disabled.
Ports A, B, and C function as an address bus, ports D and E function as a data bus, and parts of
ports F and G carry bus control signals.
The initial bus mode after a reset is 16 bits, with 16-bit access to all areas. However, if 8-bit access
is designated for all areas by the bus controller, the bus mode switches to 8 bits.
3.3.2
The CPU can access a 16-Mbyte address space in advanced mode. The on-chip ROM is disabled.
Ports A, B, and C function as an address bus, ports D and E function as a data bus, and parts of
ports F and G carry bus control signals.
The initial bus mode after a reset is 8 bits, with 8-bit access to all areas. However, if 16-bit access
is designated for any one of the areas by the bus controller, the bus mode switches to 16 bits and
port E functions as a data bus.
3.3.3
This mode is a boot mode of the flash memory. This mode is the same as mode 7, except for the
programming and erasure on the flash memory. Mode 3 is only available in the flash memory
version.
3.3.4
The CPU can access a 16-Mbyte address space in advanced mode. The on-chip ROM is enabled.
The program in the on-chip ROM connected to the first half of area 0 is executed.
Ports A, B, and C function as input ports immediately after a reset, but can be set to function as an
address bus depending on each port register setting. Ports D functions as a data bus, and parts of
ports F and G carry bus control signals. For details, see section 10, I/O Ports.
The initial bus mode after a reset is 8 bits, with 8-bit access to all areas. However, if 16-bit access
is designated for any area by the bus controller, the bus mode switches to 16 bits and port E
functions as a data bus.
Operating Mode Descriptions
Mode 1
Mode 2
Mode 3
Mode 4
Rev.7.00 Mar. 18, 2009 page 75 of 1136
Section 3 MCU Operating Modes
REJ09B0109-0700