h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 125
h8s-2138
Manufacturer Part Number
h8s-2138
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2138.pdf
(1061 pages)
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3.1
3.1.1
The H8S/2138 Group and H8S/2134 Group have 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/2138 Group and
H8S/2134 Group actually access a maximum of 16 Mbytes. However, as there are 16 external
address output pins, advanced mode is enabled only in single-chip mode or in expanded mode
with on-chip ROM enabled when a specific area in the external address space is accessed using
IOS. The external data bus width is 8 bits.
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/2138 Group and H8S/2134 Group 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
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. 4.00 Jun 06, 2006 page 71 of 1004
Section 3 MCU Operating Modes
REJ09B0301-0400
On-Chip
ROM
—
Disabled
Enabled
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