Freescale Semiconductor MC68HC08KH12 - Manual (Page 228)

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15.5 Port-E Keyboard Interrupt Block Diagram
Figure 15-4. Port-E Keyboard Interrupt Block Diagram
KBEIE0
KBEIE3
.
.
.
D Q
CK
CLR
V
DD
MODEE
IMASKE
KEYBOARD
INTERRUPT FF
VECTOR FETCH
DECODER
ACKE
INTERNAL BUS
RESET
KBE3
KBE0
SYNCHRONIZER
KEYEF
Port-E
Keyboard
Interrupt
Request
PEPE0
PEPE3 TO PULLUP ENABLE
TO PULLUP ENABLE