mc9s08ac16 Freescale Semiconductor, Inc, mc9s08ac16 Datasheet - Page 81
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mc9s08ac16
Manufacturer Part Number
mc9s08ac16
Description
Hcs08 Microcontrollers 8-bit Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08AC16.pdf
(338 pages)
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Chapter 6
Parallel Input/Output
6.1
This chapter explains software controls related to parallel input/output (I/O). The MC9S08AC16 has seven
I/O ports which include a total of 54 general-purpose I/O pins. See
more information about the logic and hardware aspects of these pins.
Many of these pins are shared with on-chip peripherals such as timer systems, communication systems, or
keyboard interrupts. When these other modules are not controlling the port pins, they revert to
general-purpose I/O control.
Freescale Semiconductor
Introduction
Not all general-purpose I/O pins are available on all packages. To avoid
extra current drain from floating input pins, the user’s reset initialization
routine in the application program should either enable on-chip pullup
devices or change the direction of unconnected pins to outputs so the pins
do not float.
MC9S08AC16 Series Data Sheet, Rev. 0
PRELIMINARY
NOTE
Chapter 2, “Pins and
Connections” for
81
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