MC68HC705 MOTOROLA [Motorola, Inc], MC68HC705 Datasheet - Page 81

• Manufacturer Part Number: MC68HC705
• Description: HCMOS Microcontroller Unit
• Manufacturer: MOTOROLA [Motorola, Inc]

7.4.3 Port B Logic
MC68HC705C8A — Rev. 2.0
MOTOROLA
RESET
EXTERNAL INTERRUPT VECTOR FETCH
FROM OTHER
PORT B PINS
IRQ
WRITE $0005
WRITE $0001
READ $0005
READ $0001
FROM OPTION
RESET
REGISTER
Figure 7-6
IRQ
DATA DIRECTION
Figure 7-6. Port B I/O Logic
PORT B DATA
REGISTER B
REGISTER
BIT DDRB7
shows the port B I/O logic.
BIT PB7
Parallel Input/Output (I/O)
FROM MOR1
V
DD
PBPU7
D
C
LATCH
IRQ
R
Q
Q
FROM CCR
V
I BIT
DD
Parallel Input/Output (I/O)
PB7
INTERRUPT
EXTERNAL
REQUEST
Technical Data
Port B
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