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HD64F2149YV bảng dữ liệu(PDF) 107 Page - Renesas Technology Corp

tên linh kiện HD64F2149YV
Giải thích chi tiết về linh kiện  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
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Section 3 MCU Operating Modes
Rev. 3.00 Jan 18, 2006 page 79 of 1044
REJ09B0280-0300
Section 3 MCU Operating Modes
3.1
Overview
3.1.1
Operating Mode Selection
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
MCU Operating Mode Selection
MCU
Operating
Mode
MD1
MD0
CPU
Operating
Mode
Description
On-Chip
ROM
0
00—
—
—
1
1
Normal
Expanded mode with on-chip ROM disabled
Disabled
2
1
0
Advanced
Expanded mode with on-chip ROM enabled
Single-chip mode
Enabled
3
1
Normal
Expanded mode with on-chip ROM enabled
Single-chip mode
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.



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