Freescale Semiconductor MC68HC08KH12 - Manual (Page 222)

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15.4 Port-D Keyboard Interrupt Block Diagram
Figure 15-1. Port-D Keyboard Interrupt Block Diagram
KBDIE0
KBDIE7
.
.
. Port-D
D Q
CK
CLR
V
DD
MODED
IMASKD
KEYBOARD
INTERRUPT FF
VECTOR FETCH
DECODER
ACKD
INTERNAL BUS
RESET
TO PULLUP ENABLE
KBD7
KBD0
TO PULLUP ENABLE
SYNCHRONIZER
KEYDF
Keyboard
Interrupt
Request