5 port-e keyboard interrupt block diagram, Port-e keyboard interrupt block diagram – Freescale Semiconductor MC68HC08KH12 User Manual

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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