MC68HC705C Motorola, MC68HC705C Datasheet - Page 81
MC68HC705C
Manufacturer Part Number
MC68HC705C
Description
HCMOS Microcontroller Unit
Manufacturer
Motorola
Datasheet
1.MC68HC705C.pdf
(222 pages)
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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
81