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NSC800D bảng dữ liệu(PDF) 17 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện NSC800D
Giải thích chi tiết về linh kiện  NSC800TM High-Performance Low-Power CMOS Microprocessor
PDF  76 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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NSC800D bảng dữ liệu(HTML) 17 Page - National Semiconductor (TI)

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90 Timing and Control (Continued)
During the opcode fetch the CPU places the contents of
the PC on the address bus The falling edge of ALE indi-
cates a valid address on the AD(0 – 7) lines The WAIT input
is sampled during t2 and if active causes the NSC800 to
insert a wait state (tw) WAIT is sampled again during tw so
that when it goes inactive the CPU continues its opcode
fetch by latching in the data on the rising edge of RD from
the AD(0 – 7) lines During t3 RFSH goes active and AD(0–
7) has the dynamic RAM refresh address from register R
and A(8 – 15) the interrupt vector from register I
TLC5171 – 17
FIGURE 10a Memory ReadWrite Cycles without WAIT States
TLC5171 – 18
FIGURE 10b Memory Read and Write with WAIT States
17



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