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H8S/2214 数据表(PDF) 131 Page - Renesas Technology Corp

部件名 H8S/2214
功能描述  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  936 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8S/2214 数据表(HTML) 131 Page - Renesas Technology Corp

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Section 3 MCU Operating Modes
Rev.4.00 Sep. 18, 2008 Page 71 of 872
REJ09B0189-0400
Section 3 MCU Operating Modes
3.1
Overview
3.1.1
Operating Mode Selection
The H8S/2214 Group has four operating modes (modes 4 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 (MD2 to MD0).
Table 3.1 lists the MCU operating modes.
Table 3.1
MCU Operating Mode Selection
External Data Bus
MCU
Operating
Mode
MD2 MD1 MD0
CPU
Operating
Mode
Description
On-Chip
ROM
Initial
Width
Max.
Width
0*
0
0
0
—
—
—
—
1*
1
2*
1
0
3*
1
4
1
0
0
Advanced
Disabled
16 bits
16 bits
5
1
On-chip ROM disabled,
expanded mode
8 bits
16 bits
6
1
0
On-chip ROM enabled,
expanded mode
Enabled
8 bits
16 bits
7
1
Single-chip mode
—
Note: * Not available in the H8S/2214 Group.
The CPU’s architecture allows for 4 Gbytes of address space, but the H8S/2214 Group actually
accesses a maximum of 16 Mbytes.
Modes 4 to 6 are externally expanded modes that allow access to external memory and peripheral
devices.
The external expansion modes allow switching between 8-bit and 16-bit bus modes. After program
execution starts, an 8-bit or 16-bit address space can be set for each area, depending on the bus
controller setting. If 16-bit access is selected for any one area, 16-bit bus mode is set; if 8-bit
access is selected for all areas, 8-bit bus mode is set.



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