MC68HC908QY2 MOTOROLA [Motorola, Inc], MC68HC908QY2 Datasheet - Page 179

• Manufacturer Part Number: MC68HC908QY2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

14.4 Functional Description
MOTOROLA
1. For AWUGEN logic refer to
TO PULLUP ENABLE
TO PULLUP ENABLE
KBI0
KBI5
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
AWUIREQ
KBIE0
KBIE5
(1)
.
.
.
Figure 14-2. Keyboard Interrupt Block Diagram
Figure
Writing to the KBIE0–KBIE5 bits in the keyboard interrupt enable register
(KBIER) independently enables or disables each port A pin as a
keyboard interrupt pin. Enabling a keyboard interrupt pin in port A also
enables its internal pullup device irrespective of PTAPUEx bits in the
port A input pullup enable register (see
Enable
latches a keyboard interrupt request.
Writing the AWUIE bit in the keyboard interrupt enable register enables
or disables the auto wake-up interrupt input (see
applied to the AWUIREQ input with auto wake-up interrupt request
enabled, latches a keyboard interrupt request.
14-5.
Register). A logic 0 applied to an enabled keyboard interrupt pin
MODEK
Keyboard Interrupt Module (KBI)
V
DD
D
CK
CLR
Q
INTERRUPT FF
KEYBOARD
RESET
ACKK
IMASKK
12.3.3 Port A Input Pullup
SYNCHRONIZER
VECTOR FETCH
INTERNAL BUS
DECODER
Keyboard Interrupt Module (KBI)
Figure
KEYF
Functional Description
14-5). A logic 1
KEYBOARD
INTERRUPT
REQUEST
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