Section 3 Mcu Operating Modes; Operating Mode Selection - Renesas H8SX/1650 Hardware Manual

3.1

Operating Mode Selection

This LSI has two operating modes (modes 4 and 5). The operating mode is selected by the setting
of mode pins (MD2 to MD0). Table 3.1 lists MCU operating mode settings.
Table 3.1 MCU Operating Mode Settings
MCU
Operating
Mode MD2 MD1
4 1 0
5 1 0
In this LSI, advanced mode for the CPU operating mode, 16 Mbytes for the address space, and
eight or 16 bits for the default external bus width are available.
In modes 4 and 5, which are external extended modes, it is possible to access the external memory
and devices. In external extended mode, the external address space can be designated as 8-bit or
16-bit address space for each area by the bus controller after starting program execution. If 16-bit
address space is designated for any one area, the bus mode switches to 16 bits. If 8-bit address
space is designated for all areas, the bus mode switches to 8 bits.

Section 3 MCU Operating Modes

CPU
Operating
MD0 Mode
0 Advanced
1
Address
Space Description
16 Mbytes On-chip ROM
disabled extended
mode
Rev.2.00 Jun. 28, 2007 Page 61 of 666
Section 3 MCU Operating Modes
External Data
Bus Width
On-Chip
ROM Default Max.
Disabled 16 bits
Disabled 8 bits
REJ09B0311-0200
16 bits
16 bits