N
O
N-D
I
SC
L
O
SU
R
E
AG
R
EEMENT
R
E
Q
U
IR
ED
Input/Output Ports
Advance Information
MC68HC05C9A — Rev. 5.0
60
Input/Output Ports
MOTOROLA
Figure 7-2. Port B I/O Logic
DATA DIRECTION
REGISTER B
BIT DDRB7
PBX
EXTERNAL
INTERRUPT
REQUEST
PORT B DATA
REGISTER
BIT PB7
READ $0005
WRITE $0001
READ $0001
RESET
IN
TE
RNA
LD
AT
A
B
U
S
WRITE $0005
PORT B EXTERNAL INTERRUPT
FROM OTHER
VDD
PORT B PINS
D
C
Q
R
Q
I BIT
VDD
FROM CCR
RESET
EXTERNAL INTERRUPT VECTOR FETCH
IRQ
MASK OPTION
VDD
ENABLED
DISABLED
EDGE ONLY
EDGE AND LEVEL
SOFTWARE CONTROLLED OPTION
