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HD64F2149YV bảng dữ liệu(PDF) 172 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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HD64F2149YV bảng dữ liệu(HTML) 172 Page - Renesas Technology Corp

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Section 6 Bus Controller
Rev. 3.00 Jan 18, 2006 page 144 of 1044
REJ09B0280-0300
Bit 5—Bus Width Control (ABW): Specifies whether the external memory space is 8-bit access
space or 16-bit access space.
Bit 5
ABW
Description
0
External memory space is designated as 16-bit access space
1
External memory space is designated as 8-bit access space
(Initial value)
Bit 4—Access State Control (AST): Specifies whether the external memory space is 2-state
access space or 3-state access space, and simultaneously enables or disables wait state insertion.
Bit 4
AST
Description
0
External memory space is designated as 2-state access space
Wait state insertion in external memory space accesses is disabled
1
External memory space is designated as 3-state access space
(Initial value)
Wait state insertion in external memory space accesses is enabled
Bits 3 and 2—Wait Mode Select 1 and 0 (WMS1, WMS0): These bits select the wait mode
when external memory space is accessed while the AST bit is set to 1.
Bit 3
Bit 2
WMS1
WMS0
Description
0
0
Program wait mode
(Initial value)
1
Wait-disabled mode
1
0
Pin wait mode
1
Pin auto-wait mode



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