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TMP91CW18A bảng dữ liệu(PDF) 21 Page - Toshiba Semiconductor

tên linh kiện TMP91CW18A
Giải thích chi tiết về linh kiện  Original CMOS 16-Bit Microcontroller
PDF  278 Pages
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nhà sản xuất  TOSHIBA [Toshiba Semiconductor]
Trang chủ  http://www.semicon.toshiba.co.jp/eng
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TMP91CW18A bảng dữ liệu(HTML) 21 Page - Toshiba Semiconductor

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TMP91CW18A
2005-08-15
91CW18A-19
(2) Single drive for high-frequency oscillator
(Purpose)
Not need twin-drive and protect mistake-operation by inputted noise to X2 pin when
the external oscillator is used.
(Block diagram)
(Setting method)
When a 1 is written to the EMCCR0<EXTIN>, the oscillator is disabled and is
operated as a buffer. The X2 pin always outputs a 1.
<EXTIN> is initialized to 0 by a reset.
Note: Do not write EMCCR0<EXTIN>
= “1” when using external resonator.
(3) Disabling ALE pin output
(Purpose)
If the CPU does not access any external area, output of the ALE pulse can be
disabled, thereby reduction noise.
(Block diagram)
(Setting method)
Writing 0 to the EMCCR0<ALEEN> register sets the ALE pin to high-impedance.
<ALEEN> is initialized to 0 by a reset.
If the CPU needs to access an external area, 1 must first be written to <ALEEN>.
ALE pin
EMCCR0<ALEEN>
Internal ALE
X1 pin
X2 pin
Enable oscillation
fOSCH
STOP
EMCCR0<DRVOSCH> (STOP+EMCCR0<EXTIN>)



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