h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 107

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

3.1
3.1.1
The H8S/2169 or H8S/2149 has three operating modes (modes 1 to 3). These modes enable
selection of the CPU operating mode and enabling/disabling of on-chip ROM, by setting the mode
pins (MD1 and MD0).
Table 3.1 lists the MCU operating modes.
Table 3.1
The CPU’s architecture allows for 4 Gbytes of address space, but the H8S/2169 or H8S/2149
actually access a maximum of 16 Mbytes.
Mode 1 is an externally expanded mode that allows access to external memory and peripheral
devices. With modes 2 and 3, operation begins in single-chip mode after reset release, but a
transition can be made to external expansion mode by setting the EXPE bit in MDCR.
The H8S/2169 or H8S/2149 can only be used in modes 1 to 3. These means that the mode pins
must select one of these modes. Do not changes the inputs at the mode pins during operation.
MCU
Operating
Mode
0
1
2
3
Operating Mode Selection
Overview
MCU Operating Mode Selection
MD1
0
1
MD0
0
1
0
1
Section 3 MCU Operating Modes
CPU
Operating
Mode
—
Normal
Advanced
Normal
Description
—
Expanded mode with on-chip ROM enabled
Single-chip mode
Single-chip mode
Expanded mode with on-chip ROM disabled Disabled
Expanded mode with on-chip ROM enabled
Rev. 3.00 Jan 18, 2006 page 79 of 1044
Section 3 MCU Operating Modes
REJ09B0280-0300
On-Chip
ROM
—
Enabled