Datasheet

Table Of Contents
Section 3 MCU Operating Modes
REJ09B0140-0900 Rev. 9.00 Page 63 of 846
Sep 16, 2010
H8S/2215 Group
Section 3 MCU Operating Modes
3.1 Operating Mode Selection
This LSI supports four operating modes (modes 7 to 4). These modes are depending on the setting
of mode pins (MD2 to MD0). Modes 6 to 4 are extended modes in which external memory and
external peripheral devices can be accessed. In extended modes, each area can be used as 8-bit or
16-bit address space according to the bus controller settings after program execution. In this case,
if an area is specified as 16-bit access space, 16-bit bus mode is employed for all areas; while if an
area is specified as 8-bit access space, 8-bit bus mode is employed for all areas. In mode 7,
external addresses cannot be used. Do not change the mode pin settings during operation.
Table 3.1 MCU Operating Mode Selection
External Data Bus
MCU
Operating
Mode MD2 MD1 MD0
CPU Operating
Mode
Description
On-Chip
ROM
Initial Value
Maximum
Value
4 1 0 0 Advanced mode On-chip ROM
disabled, extended
mode
Disabled 16 bits 16 bits
5 1 0 1 Advanced mode On-chip ROM
disabled, extended
mode
Disabled 8 bits 16 bits
6 1 1 0 Advanced mode On-chip ROM
enabled, extended
mode
Enabled 8 bits 16 bits
7
*
1 1 1 Advanced mode Single-chip mode Enabled — —
Note: * The following applies to the use of mode 7.
(1) H8S/2215
The USB cannot be used in mode 7.
(2) H8S/2215R, H8S/2215T or H8S/2215C
Development work using the E6000 emulator:
The USB cannot be used in mode 7.
Development work using the on-chip (E10A-USB) emulator:
The USB can be used in mode 7.
See section 3.3.4, Mode 7, for details.