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SH7014 bảng dữ liệu(PDF) 170 Page - Renesas Technology Corp

tên linh kiện SH7014
Giải thích chi tiết về linh kiện  32-Bit RISC Microcomputer
PDF  754 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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SH7014 bảng dữ liệu(HTML) 170 Page - Renesas Technology Corp

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8. Bus State Controller (BSC)
Rev.5.00 Sep. 27, 2007 Page 136 of 716
REJ09B0398-0500
CK
CASx
RAS
TRp
TRr1
TRr2
TRc
TRc
Figure 8.16 Self-Refresh Timing
8.5
Address/Data Multiplex I/O Space Access
When the BCR1 register IOE bit is set to 1, the D15 to D0 pins can be used for multiplexed
address/data I/O for the CS3 space. Consequently, peripheral LSIs requiring address/data
multiplexing can be directly connected to this LSI.
Address/data multiplex I/O space bus width is selected by the A14 bit, and is 8 bit when A14 = 0
and 16 bit when A14 = 1.
8.5.1
Basic Timing
When the IOE bit of the BCR1 is set to 1, CS3 space becomes address/data multiplex I/O space.
When this space is accessed, addresses and data are multiplexed. When the A14 address bit is 0,
the bus size becomes 8 bit and addresses and data are input and output through the D7 to D0 pins.
When the A14 address bit is 1, the bus size becomes 16 bit and address output and data I/O occur
through the D15 to D0 pins. Access for the address/data multiplex I/O space is controlled by the
AH, RD and WRx signals.
Address/data multiplex I/O space accesses are done after a 3-cycle (fixed) address output, as an
ordinary space type access (figure 8.17).



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