XC68HC08KH12 Motorola, XC68HC08KH12 Datasheet - Page 230
XC68HC08KH12
Manufacturer Part Number
XC68HC08KH12
Description
MICROCONTROLLER
Manufacturer
Motorola
Datasheet
1.XC68HC08KH12.pdf
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Keyboard Interrupt Module (KBI)
15.5.2 Port-E Keyboard Initialization
Advance Information
230
NOTE:
The vector fetch or software clear and the return of all enabled keyboard
interrupt pins to logic 1 may occur in any order.
If the MODEE bit is clear, the keyboard interrupt pin is
falling-edge-sensitive only. With MODEE clear, a vector fetch or
software clear immediately clears the keyboard interrupt request.
Reset clears the keyboard interrupt request and the MODEE bit, clearing
the interrupt request even if a keyboard interrupt pin stays at logic 0.
The keyboard flag bit (KEYEF) in the keyboard status and control
register can be used to see if a pending interrupt exists. The KEYEF bit
is not affected by the keyboard interrupt mask bit (IMASKE) which
makes it useful in applications where polling is preferred.
To determine the logic level on a keyboard interrupt pin, disable the
pull-up device, use the data direction register to configure the pin as an
input and then read the data register.
Setting a keyboard interrupt enable bit (KBEIEx) forces the
corresponding keyboard interrupt pin to be an input, overriding the data
direction register.
When a keyboard interrupt pin is enabled, it takes time for the internal
pullup to reach a logic 1. Therefore a false interrupt can occur as soon
as the pin is enabled.
To prevent a false interrupt on keyboard initialization:
1. Mask keyboard interrupts by setting the IMASKE bit in the
2. Write to DDREx bits to make port pin an input pin.
3. Enable the KBI pins by setting the appropriate KBEIEx bits in the
•
Return of all enabled keyboard interrupt pins to logic 1 — As long
as any enabled keyboard interrupt pin is at logic 0, the keyboard
interrupt remains set.
keyboard status and control register.
keyboard interrupt enable register.
Keyboard Interrupt Module (KBI)
MC68HC(7)08KH12
MOTOROLA
—
Rev. 1.0
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