Section 3 Mcu Operating Modes; Operating Mode Selection - Renesas H8S/2368 Series Hardware Manual

3.1

Operating Mode Selection

This LSI has five operating modes (modes 1 to 4 and 7). Modes 1 to 4 and 7 are available in the
flash memory version. Modes 1, 2, 4, and 7 are available in the masked ROM version. Modes 1
and 2 are available in the ROMless version. The operating mode is selected by the setting of mode
pins (MD2 to MD0).
Modes 1, 2, and 4 are externally expanded modes in which the CPU can access an external
memory and peripheral devices. In the externally expanded mode, each area can be switched to 8-
bit or 16-bit address space by the bus controller. If any one of the areas is set to 16-bit address
space, the bus mode is 16 bits. If all areas are set to 8-bit address space, the bus mode is 8 bits.
Mode 7 is a single-chip activation externally expanded mode in which the CPU can switch to
access an external memory and peripheral devices at the beginning of a program execution.
Mode 3 is a boot mode in which the flash memory can be programmed or erased. For details on
the boot mode, refer to section 19, Flash Memory (F-ZTAT Version).
Do not change the MD2 to MD0 pin settings during operation.
Table 3.1 MCU Operating Mode Selection
MCU
Operating
Mode MD2 MD1 MD0
1 0 0
2 0 1
3 0 1
4 1 0
7 1 1

Section 3 MCU Operating Modes

CPU
Operating
Mode Description
1 Advanced
0 Advanced
1 Advanced
0 Advanced
1 Advanced
Expanded mode with
on-chip ROM disabled
Expanded mode with
on-chip ROM disabled
Boot mode
Expanded mode with
on-chip ROM enabled
Single-chip mode
External Data
Bus
On-Chip Initial Max.
ROM Width Value
Disabled 16 bits 16 bits
Disabled 8 bits 16 bits
Enabled — 16 bits
Enabled 8 bits 16 bits
Enabled — 16 bits
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