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MC9S08AW60 Datasheet(PDF) 31 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) 31 Page - Freescale Semiconductor, Inc

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Chapter 2 Pins and Connections
MC9S08AW60 Data Sheet, Rev 2
Freescale Semiconductor
31
When an on-chip peripheral system is controlling a pin, data direction control bits still determine what is
read from port data registers even though the peripheral module controls the pin direction by controlling
the enable for the pin’s output buffer. See the Chapter 6, “Parallel Input/Output” chapter for more details.
Pullup enable bits for each input pin control whether on-chip pullup devices are enabled whenever the pin
is acting as an input even if it is being controlled by an on-chip peripheral module. When the PTD7, PTD3,
PTD2, and PTG4 pins are controlled by the KBI module and are configured for rising-edge/high-level
sensitivity, the pullup enable control bits enable pulldown devices rather than pullup devices.
NOTE
When an alternative function is first enabled it is possible to get a spurious
edge to the module, user software should clear out any associated flags
before interrupts are enabled. Table 2-1 illustrates the priority if multiple
modules are enabled. The highest priority module will have control over the
pin. Selecting a higher priority pin function with a lower priority function
already enabled can cause spurious edges to the lower priority module. It is
recommended that all modules that share a pin be disabled before enabling
another module.
PTF3–PTF0
TPM1CH5–
TPM1CH2
Chapter 10, “Timer/PWM (S08TPMV2)”
PTG4–PTG0
KBI1P4–KBI1P0
Chapter 9, “Keyboard Interrupt (S08KBIV1)”
PTG6–PTG5
EXTAL–XTAL
Chapter 8, “Internal Clock Generator (S08ICGV4)”
1 See the listed chapter for information about modules that share these pins.
Table 2-1. Pin Sharing Priority
Lowest <- Pin Function Priority -> Highest
Reference1
Port Pins
Alternate Function
Alternate Function


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