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MC9S08AW60 Datasheet(PDF) 81 Page - Freescale Semiconductor, Inc

No. de Pieza. MC9S08AW60
Descripción  Microcontrollers
Descarga  324 Pages
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Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC9S08AW60 Datasheet(HTML) 81 Page - Freescale Semiconductor, Inc

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MC9S08AW60 Data Sheet, Rev 2
Freescale Semiconductor
81
Chapter 6
Parallel Input/Output
6.1
Introduction
This chapter explains software controls related to parallel input/output (I/O). The MC9S08AW60 has
seven I/O ports which include a total of 54 general-purpose I/O pins. See Chapter 2, “Pins and
Connections” for 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.
Pins that are not used in the application must be terminated. This prevents excess current caused by floating
inputs and enhances immunity during noise or transient events. Termination methods include:
Configuring unused pins as outputs driving high or low
Configuring unused pins as inputs and using internal or external pullups
Never connect unused pins to VDD or VSS.
6.2
Features
Parallel I/O and Pin Control features, depending on package choice, include:
A total of 54 general-purpose I/O pins in seven ports
Hysteresis input buffers
Software-controlled pullups on each input pin
Table 6-1. KBI and Parallel I/O Interaction
PTxPEn
(Pull Enable)
PTxDDn
(Data Direction)
KBIPEn
(KBI Pin Enable)
KBEDGn
(KBI Edge Select)
Pullup
Pulldown
000
x1
1 x = Don’t care
disabled
disabled
1
0
0
x
enabled
disabled
x
1
0
x
disabled
disabled
1
x
1
0
enabled
disabled
1
x
1
1
disabled
enabled
0
x
1
x
disabled
disabled


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