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H8S2245 데이터시트(PDF) 114 Page - Renesas Technology Corp

부품명 H8S2245
상세설명  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

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Section 3 MCU Operating Modes
Rev.3.00 Mar. 26, 2007 Page 72 of 772
REJ09B0355-0300
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.
Note that the functions of each pin depend on the operating mode.
The H8S/2245 Group can be used only in modes 1 to 7. 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
Register Configuration
The H8S/2245 Group has a mode control register (MDCR) that indicates the inputs at the mode
pins (MD
2 to MD0), and a system control register (SYSCR) that controls the operation of the
H8S/2245 Group. Table 3.2 summarizes these registers.
Table 3.2
Register Configuration
Name
Abbreviation
R/W
Initial Value
Address*
Mode control register
MDCR
R
Undetermined
H'FF3B
System control register
SYSCR
R/W
H'01
H'FF39
Note:
*
Lower 16 bits of the address.



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