Freescale Semiconductor, Inc.
Interrupts
V
DD
PBPU7
FROM MOR1
READ $0005
WRITE $0005
RESET
DATA DIRECTION
REGISTER B
BIT DDRB7
U
B
A
T
PORT B DATA
REGISTER
BIT PB7
D
WRITE $0001
L
PB7
READ $0001
IRQ
FROM OPTION
REGISTER
VDD
EXTERNAL
INTERRUPT
REQUEST
D
Q
Q
FROM OTHER
PORT B PINS
C
R
I BIT
FROM CCR
IRQ
RESET
EXTERNAL INTERRUPT VECTOR FETCH
Figure 4-3. Port B I/O Logic
Technical Data
54
MC68HC705C8A — Rev. 3
Interrupts
For More Information On This Product,
Go to: www.freescale.com