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PC87591E bảng dữ liệu(PDF) 76 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện PC87591E
Giải thích chi tiết về linh kiện  LPC Mobile Embedded Controllers
PDF  437 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87591E bảng dữ liệu(HTML) 76 Page - National Semiconductor (TI)

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4.0 Embedded Controller Modules (Continued)
www.national.com
76
Revision 1.07
4.1.6
Normal Read Bus Cycle
A read bus cycle starts at T1; at this point, the address is placed on the address bus, SELn (or SELIO) is activated and
WR0-1 are inactive, indicating that this is a read bus cycle. The RD signal is activated on the first TIW or T2 (when there are
no TIW cycles).
At the end of T2, the BIU samples the data on D0-7 or D0-15, according to BW signal in SZCFGn register. After T2, the
number of Thold cycles specified by HOLD in SZCFGn register (may be 0) is added. SELn and RD are deactivated on the
first Thold cycle. The address remains valid until the end of the last Thold cycle.
CLK
A0-19
SEL0-1,
D0-15
RD
WR0-1
Normal Read
Late Write
Normal Read
T1
T2
T1
T2
T1
T2
Bus State
In
Out
In
BST0-2
SELIO
Figure 16. Late Write Bus Cycle Between Normal Read Bus Cycles with 0 Wait
CLK
A0-19
SELn
D0-15
RD
WR0-1
Bus State
T1
TIW
T2
Thold
BST0-2
Figure 17. Late Write Bus Cycle with 1 Internal Wait and 1 Hold
Out



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