H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 104

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 3 MCU Operating Modes
Note that the functions of each pin depend on the operating mode.
The H8S/2350 can be used only in modes 1, 4, and 5. This means that the mode pins must be set
to select one of these modes. Do not change the inputs at the mode pins during operation.
3.1.2
The H8S/2351 has seven operating modes (modes 1 to 7). These modes enable selection of the
CPU operating mode, enabling/disabling of on-chip ROM, and the initial bus width setting, by
setting the mode pins (MD
Table 3.2 lists the MCU operating modes.
Table 3.2
The CPU’s architecture allows for 4 Gbytes of address space, but the H8S/2351 actually accesses
a maximum of 16 Mbytes.
Modes 1, 2, and 4 to 6 are externally expanded modes that allow access to external memory and
peripheral devices.
Rev. 3.00 Sep 15, 2006 page 70 of 988
REJ09B0330-0300
MCU
Operating
Mode
0
1
2
3
4
5
6
7
H8S/2351 Operating Mode Selection
MD
0
1
MCU Operating Mode Selection (H8S/2351)
2
MD
0
1
0
1
1
0
MD
1
0
1
0
1
0
1
2
0
to MD
CPU
Operating
Mode
—
Normal
Advanced
0
).
Description
—
On-chip ROM
disabled, expanded
mode
On-chip ROM
enabled, expanded
mode
Single-chip mode
On-chip ROM
disabled, expanded
mode
On-chip ROM
enabled, expanded
mode
Single-chip mode
On-Chip
ROM
—
Disabled
Enabled
Enabled
Disabled
External Data Bus
Initial
Width
—
8 bits
8 bits
—
16 bits
8 bits
8 bits
—
Max.
Width
—
16 bits
16 bits
—
16 bits
16 bits
16 bits
—