mc9s08ac16 Freescale Semiconductor, Inc, mc9s08ac16 Datasheet - Page 159

• Manufacturer Part Number: mc9s08ac16
• Description: Hcs08 Microcontrollers 8-bit Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 9
Keyboard Interrupt (S08KBIV1)
9.1
The MC9S08AC16 Series has one KBI module with seven keyboard interrupt inputs that are shared with
port D and port G pins. See
hardware aspects of these pins.
9.2
The KBI input KBIP6 shares a common pin with PTD3 and AD11, and KBI input KBIP5 shares a common
pin with PTD2 and AD10. The sharing of each of these inputs with port and ADC functions operates in
the same way as described above for KBIP7.
The KBI inputs KBIP4 – KBIP0 are shared on common pins with PTG4 – PTG0. These pins all operate
in the same way as described above for KBIP7 except that none are shared with an ADC input.
KBIP3 – KBIP0 are always falling-edge/low-level sensitive. KBIP7 – KBIP4 can be configured for
rising-edge/high-level or for falling-edge/low-level sensitivity. When any of the inputs KBIP7 – KBIP0 are
enabled and configured to detect rising edges/high levels, and the pin pullup is enabled through the
corresponding port pullup enable bit for that pin, a pulldown resistor rather than a pullup resistor is enabled
on the pin.
9.3
The keyboard interrupt (KBI) module features include:
Freescale Semiconductor
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Four falling edge/low level sensitive
Four falling edge/low level or rising edge/high level sensitive
Choice of edge-only or edge-and-level sensitivity
Common interrupt flag and interrupt enable control
Capable of waking up the MCU from stop3, stop2, stop1, or wait mode
Introduction
Keyboard Pin Sharing
Features
Chapter 2, “Pins and
MC9S08AC16 Series Data Sheet, Rev. 0
PRELIMINARY
Connections,” for more information about the logic and
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