h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 117

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

3.1
This LSI has three operating modes (modes 1 to 3). The operating mode is determined by the
setting of the mode pins (MD1 and MD0). Table 3.1 shows the MCU operating mode selection.
Table 3.1 lists the MCU operating modes.
Table 3.1
Mode 1 is an 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 to 1.
Mode 0 cannot be used in this LSI. Thus, mode pins should be set to enable mode 1, 2 or 3 in
normal program execution state. Mode pins should not be changed during operation.
3.2
The following registers are related to the operating mode. For details on the bus control register
(BCR), refer to section 6.3.1, Bus Control Register (BCR).
MCU
Operating
Mode
0
1
2
3
Mode control register (MDCR)
System control register (SYSCR)
Serial timer control register (STCR)
MCU Operating Mode Selection
Register Descriptions
MD1
0
1
MCU Operating Mode Selection
MD0
0
1
0
1
Section 3 MCU Operating Modes
CPU
Operating
Mode
—
Normal
Advanced
Normal
Description
—
Expanded mode with on-chip ROM disabled
Expanded mode with on-chip ROM enabled
Single-chip mode
Expanded mode with on-chip ROM enabled
Single-chip mode
Rev. 3.00 Mar 21, 2006 page 63 of 788
Section 3 MCU Operating Modes
REJ09B0300-0300
On-Chip
ROM
—
Disabled
Enabled