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68HC705JB2 bảng dữ liệu(PDF) 47 Page - NXP Semiconductors

tên linh kiện 68HC705JB2
Giải thích chi tiết về linh kiện  Industry standard M68HC05 CPU core
PDF  128 Pages
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nhà sản xuất  NXP [NXP Semiconductors]
Trang chủ  http://www.nxp.com
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68HC705JB2 bảng dữ liệu(HTML) 47 Page - NXP Semiconductors

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August 28, 1998
GENERAL RELEASE SPECIFICATION
INPUT/OUTPUT PORTS
REV 1.1
7-1
SECTION 7
INPUT/OUTPUT PORTS
In the Normal Operating Mode, there are 11 bidirectional I/O lines arranged as
one 8-bit I/O port (Port A), and one 3-bit I/O port (Port B). Each port line can be
programed as either input or output, under software control, by the data direction
registers (DDR’s). Also, if enabled by a mask option, all Port A and Port B I/O pins
may have individual software programmable pulldown or pullup devices. PA4 to
PA7 and PB1 & PB2 pins have the additional properties of sinking higher current.
PA0 to PA3 may function as additional IRQ interrupt input sources (mask option).
PB1 and PB2 have open drain output drivers, with optional slow falling-edge
output transitions. The transition delay is 170ns (typical), with a bus rate of 3MHz
and a loading of 50pF.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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